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A l l t e s t I n s t r u me n t s , I n c .
5 0 0 C e n t r a l A v e .
F a r mi n g d a l e , N J 0 7 7 2 7
P : ( 7 3 2 ) 9 1 9 - 3 3 3 9
F : ( 7 3 2 ) 9 1 9 - 3 3 3 2
a l l t e s t . n e t
s s a l e s @ a l l t e s t . n e t
T h e t e s t & me a s u r e me n t
e q u i p me n t y o u n e e d a t
t h e p r i c e y o u w a n t .
A l l t e s t c a r r i e s t h e w o r l d ' s l a r g e s t s e l e c t i o n o f
u s e d / r e f u r b i s h e d b e n c h t o p t e s t & me a s u r e me n t
e q u i p me n t a t 5 0 % t h e p r i c e o f n e w .
O O u r e q u i p me n t i s g u a r a n t e e d w o r k i n g , w a r r a n t i e d , a n d
a v a i l a b l e w i t h c e r t i f i e d c a l i b r a t i o n f r o m o u r i n - h o u s e s t a f f
o f t e c h n i c i a n s a n d e n g i n e e r s .
• 1 0 + f u l l t i me t e c h n i c i a n s w i t h o v e r 1 5 0 y e a r s o f
s p e c i a l i z a t i o n
• 9 0 d a y w a r r a n t y & 5 d a y r i g h t o f r e t u r n o n a l l
e q u i p me n t
• • 1 - 3 y e a r w a r r a n t i e s f o r n e w a n d
p r e mi u m- r e f u r b i s h e d e q u i p me n t
• E v e r y u n i t t e s t e d t o O E M s p e c i f i c a t i o n s
• S a t i s f a c t i o n g u a r a n t e e d
Y o u h a v e p l a n s , w e w i l l h e l p y o u a c h i e v e t h e m.
A n y p r o j e c t . A n y b u d g e t .
t
G e t a q u o t e t o d a y !
C C a l l ( 7 3 2 ) 9 1 9 - 3 3 3 9 o r e ma i l s a l e s @a l l t e s t . n e t .

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  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Keysight Technologies N9040B UXA Signal Analyzer SERVICE GUIDE...
  • Page 3: Safety Notices

    DOCUMENT THAT CONFLICT WITH THESE TERMS, THE WARRANTY beyond those set forth in the TERMS IN THE SEPARATE EULA shall apply, except to the © Keysight Technologies, Inc. AGREEMENT WILL CONTROL. extent that those terms, rights, or 2015-2024 licenses are explicitly required...
  • Page 4: Where To Find The Latest Information

    Where to Find the Latest Information Documentation is updated periodically. For the latest information about this instrument, including firmware upgrades, application information, and product information, click the website link below. https://www.keysight.com/find/uxa To receive the latest updates by email, subscribe to Keysight Email Updates at the following URL: https://www.keysight.com/find/MyKeysight Information on preventing instrument damage can be found at: https://www.keysight.com/find/PreventingInstrumentRepair...
  • Page 6: Table Of Contents

    Contacting Keysight Technologies ........
  • Page 7 Contents Instrument Cannot Completely Load or Run the Operating System ....... . . 69 Troubleshooting a Blank Display.
  • Page 8 Contents 7. RF Section (RF/Microwave) What You Will Find in This Chapter ............. 147 RF Section Description .
  • Page 9 Contents 10. Analog and Digital IFs What You Will Find in This Chapter ............. 219 Overview .
  • Page 10 Contents What You Will Find in This Chapter ............. 321 Overview .
  • Page 11 Contents Signal Analyzer Hardware Requirements ........... . . 368 1 GHz Analysis Bandwidth Assembly Theory of Operation .
  • Page 12 Contents RF Area - Options 544, 550 ..............500 To gain access to any of the RF section parts for removal, follow these steps:.
  • Page 13 Contents Front Motherboard (A8 Front Motherboard)........... 568 Rear Motherboard (A7 Rear Motherboard).
  • Page 14 Contents FPGAs ..................651 Overview .
  • Page 15 Contents...
  • Page 16: Overview

    ESD Information on page 33 Instrument Maintenance on page 35 Service Equipment You Will Need on page 37 After an Instrument Repair on page 40 Contacting Keysight Technologies on page 41 How to Return Your Instrument for Service on page 43...
  • Page 17: Keysight Uxa Signal Analyzer Overview

    Hardware upgrades may require installation of optional hardware, and often require readjustment and verification of the hardware option. Virus Information Keysight Technologies does not load anti-virus software into the signal analyzer. It is the customer’s responsibility to install anti-virus software. N9040B UXA Signal Analyzer Service Guide...
  • Page 18: Instrument Option Descriptions

    Standard 4 GB Capture Memory Included with Options B2X, B5X, H1G Electronic Attenuator Enhanced Phase Noise Performance Standard External Mixing Standard Full Bypass Path Included with Options B2X, B5X, H1G Fine Step Attenuator Standard N9040B UXA Signal Analyzer Service Guide...
  • Page 19 Preamp, 100 kHz to 50 GHz Requires Option 550 Real Time Data Link Standard Real-Time I/Q Data Streaming Requires B2X or B5X Security Features, exclude launch programs Security Features, prohibit saving results Screen Video (rear panel Analog Out connector) N9040B UXA Signal Analyzer Service Guide...
  • Page 20: Before You Start Troubleshooting

    To prevent electrical shock, disconnect the analyzer from mains before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally. N9040B UXA Signal Analyzer Service Guide...
  • Page 21 Always use the three-prong ac power cord supplied with this product. Failure to ensure adequate earth grounding by not using this cord may cause product damage. This instrument has an autoranging line voltage input; be sure the supply voltage is within the specified range. N9040B UXA Signal Analyzer Service Guide...
  • Page 22: Esd Information

    1 megohm of isolation from ground. These techniques for a static-safe workstation should not be used when working on circuitry with a voltage potential greater than 500 volts. Figure 1-1 Example of a Static-Safe Workstation N9040B UXA Signal Analyzer Service Guide...
  • Page 23: Handling Of Electronic Components And Esd

    Wrist-strap, color black, stainless steel. Four adjustable links and a 7 mm post-type connection. 9300-0980 Wrist-strap cord 1.5 m (5 ft.) 9300-0797 2 ft by 4 ft conductive mat with 15 ft grounding wire N9040B UXA Signal Analyzer Service Guide...
  • Page 24: Instrument Maintenance

    Wash thoroughly after handling. In case of spill, soak up with sand or earth. Flush spill area with water. Dispose of isopropyl alcohol in accordance with all applicable federal, state, and local environmental regulations. N9040B UXA Signal Analyzer Service Guide...
  • Page 25: Battery Information

    Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended. Discard used batteries according to the manufacturer’s instructions. Do not throw batteries away but collect as small chemical waste. N9040B UXA Signal Analyzer Service Guide...
  • Page 26: Service Equipment You Will Need

    1/4 inch socket on 4 lb torque wrench source locally cable puller 5021-6773 Calibration Application Software Information regarding the Keysight X-Series Signal Analyzer Calibration Application Software can be found at the following web site: https://www.keysight.com/find/calibrationsoftware N9040B UXA Signal Analyzer Service Guide...
  • Page 27: Front End Controller Troubleshooting Kit

    E4410-60157 Part of N9020-60005 Troubleshooting kit Cable, Troubleshooting 8121-1400 Right-angle sma (m) to right-angle mmcx (m) (must be ordered separately) Connector, MMCX (f) to SMA (f) www.hubersuhner.com item number: 31_MMCX-SMZ-50-1/111_OE (must be ordered separately) N9040B UXA Signal Analyzer Service Guide...
  • Page 28: Usb Keyboard And Mouse

    The main reason why a USB storage device will be needed is to download instrument software and backup calibration data when the hard drive in an instrument needs to be replaced. The instrument software is about 3 GB. The calibration files are around 30 megabytes. N9040B UXA Signal Analyzer Service Guide...
  • Page 29: After An Instrument Repair

    These tests are done using the N7800A Keysight Calibration Application Software. Refer to Chapter 21, “Post-Repair Procedures,” for a list of post-repair adjustments and performance tests based on which hardware has been changed. https://www.keysight.com/find/calibrationsoftware N9040B UXA Signal Analyzer Service Guide...
  • Page 30: Contacting Keysight Technologies

    Keysight office using the link below. In any correspondence or telephone conversations, refer to the instrument by its model number (N9040B) and full serial number (ex. MY49250887). With this information, the Keysight representative can quickly determine whether your unit is still within its warranty period.
  • Page 31: Instrument Serial Numbers

    The serial number is located on the rear panel serial sticker or when the analyzer is power up, press System, Show System. The system information can be very useful for updates and post-sale upgrades. N9040B UXA Signal Analyzer Service Guide...
  • Page 32: How To Return Your Instrument For Service

    Original Packaging Before shipping, pack the unit in the original factory packaging materials if they are available. If the original materials were not retained, see “Other Packaging” on page N9040B UXA Signal Analyzer Service Guide...
  • Page 33: Other Packaging

    5. Seal the shipping container securely with strong nylon adhesive tape. 6. Mark the shipping container “FRAGILE, HANDLE WITH CARE” to assure careful handling. 7. Retain copies of all shipping papers. N9040B UXA Signal Analyzer Service Guide...
  • Page 34: Boot Up And Initialization

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide Boot Up and Initialization What You Will Find in This Chapter This chapter provides information that is useful when starting to troubleshoot a spectrum analyzer. It includes procedures for troubleshooting common failures and provides information on isolating problems in the analyzer.
  • Page 35: Check The Basics

    Boot Up and Initialization Check the Basics Check the Basics Before calling Keysight Technologies or returning the instrument for service, please make the following checks: 1. Is there power at the power outlet? At the power receptacle on the instrument? 2.
  • Page 36: Instrument Boot Up Process

    Figure 2-1. By default all applications are checked and therefore, will preload when the instrument application is launched. Uncheck any applications to bypass the preloading process. Figure 2-1 Configure Application N9040B UXA Signal Analyzer Service Guide...
  • Page 37: Typical Instrument Boot-Up Process Flow

    Operating” section in this chapter. 5. The Keysight Technologies splash screen is displayed in white font on a dark background for ~5-10 seconds after the analyzer is turned on. If the Keysight Technologies logo is not displayed refer to the “No Keysight...
  • Page 38 “System Processor and Disk Drive” in this manual. 8. The Keysight Technologies logo is displayed in white font on a blue background while Windows finishes loading user preferences. This can take up to 4 minutes. If this does not occur refer to the “Instrument Cannot...
  • Page 39 Boot Up and Initialization Instrument Boot Up Process Figure 2-2 Typical Instrument Sweep at Power-up N9040B UXA Signal Analyzer Service Guide...
  • Page 40: Potential Problems During Boot Process

    5. Press S1 on the A7 Midplane board, as seen in Figure 2-3. Does the instrument turn on? If yes: Refer to the “Front Panel Power Switch Is Not Working” section in this chapter. N9040B UXA Signal Analyzer Service Guide...
  • Page 41 6. Use a voltmeter to measure the DC voltage on pin #2 of S1 on the A7 Midplane board, as seen in Figure 2-3. Does pin #2 measure at least +3.0 VDC? If yes: Replace the A4 System Processor Assembly. If no: Replace the A6 Power Supply Assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 42: Front Panel Power Switch Is Not Working

    A7 Midplane board and verify that the instrument can now be turned on using the front panel power switch. If no: Proceed to the next step. Figure 2-4 A1 Front Panel Power Switch Troubleshooting N9040B UXA Signal Analyzer Service Guide...
  • Page 43 Controller J4 to the A1A6 Front Panel Power Switch Keyboard for any pinched, bare, or loose wires, and replace it if needed. If A1W4 is not damaged, replace the A1A6 Front Panel Power Switch Keyboard. N9040B UXA Signal Analyzer Service Guide...
  • Page 44: Yellow Standby Led Does Not Turn On

    2-5, verify that both the +5.1V STBY and +15 STBY LEDs on the A7 Midplane board are on (green). Are both standby LEDs on? If yes: Proceed to the next step. If no: Replace the A6 Power Supply assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 45 A7 Midplane board to ground. Does the DC voltage from pin #64 to ground measure approximately +5 VDC? If yes: Proceed to the next step. If no: Replace the A4 System Processor Assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 46 Chapter 20, “Assembly Replacement Procedures,” in this manual. 10.Referring to Figure 2-7, remove W1 from J11 of the A1A5 Front Panel Controller board and inspect the cable for any damage, and replace it if needed. N9040B UXA Signal Analyzer Service Guide...
  • Page 47 Controller J4 to the A1A6 Front Panel Power Switch Keyboard for any pinched, bare, or loose wires, and replace it if needed. If A1W4 is not damaged, replace the A1A6 Front Panel Power Switch Keyboard. N9040B UXA Signal Analyzer Service Guide...
  • Page 48: Green Power On Led Does Not Turn On

    6. Turn the instrument off using S1 on the A7 Midplane board and remove the power cord from the instrument. 7. Remove the A1 Front Panel assembly. Refer to Chapter 20, “Assembly Replacement Procedures,” in this manual. N9040B UXA Signal Analyzer Service Guide...
  • Page 49 Controller J4 to the A1A6 Front Panel Power Switch Keyboard for any pinched, bare, or loose wires, and replace it if needed. If A1W4 is not damaged, replace the A1A6 Front Panel Power Switch Keyboard. N9040B UXA Signal Analyzer Service Guide...
  • Page 50: Fan(S) Are Not Operating

    Figure 2-9. If the voltage at TP4 measures at least +7 VDC, proceed to next step. If the voltage at TP4 does not measure at least +7 VDC, replace the A6 Power Supply assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 51 If there are any disconnected or damaged connections, make the needed repairs and verify the functionality. If nothing wrong is found with the wiring harnesses, proceed to the next step. 6. Disconnect both fan wire harnesses from the A7 Midplane board. N9040B UXA Signal Analyzer Service Guide...
  • Page 52 J30 and J31 to chassis ground, as seen in Figure 2-10. Figure 2-10 Fan Power Connector Locations When the instrument is first turned on the voltage level measured should be at the maximum level that the fans would expect to see. N9040B UXA Signal Analyzer Service Guide...
  • Page 53 If all the DC voltage measurements match the expected values shown in Table 2-1, replace the fans that are not working. If all the DC voltage measurements do not match the expected values, replace the A7 Midplane board. N9040B UXA Signal Analyzer Service Guide...
  • Page 54: No Keysight Splash Screen Displayed

    Potential Problems During Boot Process No Keysight Splash Screen Displayed (Black background with white “Keysight Technologies” text) A problem of not displaying the Keysight splash screen could be caused by many different things. It could be due to a down power supply, a processor hardware problem, an instrument boot-up process error, a display section failure, etc.
  • Page 55 Boot Up and Initialization Potential Problems During Boot Process Figure 2-11 A7 Midplane Board Power Supply LEDs - Rear N9040B UXA Signal Analyzer Service Guide...
  • Page 56 Boot Up and Initialization Potential Problems During Boot Process Figure 2-12 A7 Midplane Board Power Supply LEDs - Front N9040B UXA Signal Analyzer Service Guide...
  • Page 57: Instrument Hangs At The Keysight Splash Screen

    A4 Processor board are not at fault, replace the A4 Processor board. If not: After verifying that the connections between the A6 Power Supply, the A7 Midplane board, and the A8 Motherboard are all mechanically and electrically secure, replace the A6 Power Supply assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 58: Instrument Cannot Completely Load Or Run The Operating System

    Run the Instrument Recovery System by referring to the “Instrument Image Recovery System” Chapter 13, “System Processor and Disk Drive.”. If this does not correct the problem replace the A5 Disk Drive. If not: Replace the A5 Disk Drive. N9040B UXA Signal Analyzer Service Guide...
  • Page 59: Troubleshooting A Blank Display

    4. At this point, the most likely cause for a video problem is the A4 System Processor assembly; however, it could be the result of a defective Touch Screen Display. N9040B UXA Signal Analyzer Service Guide...
  • Page 60: Display Backlight Is Not Working

    2. Remove the A1 Front Panel assembly along with the connecting ribbon cables. Refer to Chapter 20, “Assembly Replacement Procedures,” in this manual. 3. Remove the A1MP25 Front Panel Shield from the A1 Front Panel assembly, as seen in Figure 2-13. N9040B UXA Signal Analyzer Service Guide...
  • Page 61 Front Panel Shield Removal 4. Reconnect the W1 ribbon cable from the A7 Midplane board to the A1A5 Front Panel Controller board J11. 5. Reconnect the AC power cord and turn the instrument on. N9040B UXA Signal Analyzer Service Guide...
  • Page 62 If the DC voltage on pin #19 does not measure at least +3 VDC, replace the A1A5 Front Panel Controller board. 3. Referring to Figure 2-14, measure the DC voltage from pin #20 of J16 to ground. This is the backlight intensity control line. N9040B UXA Signal Analyzer Service Guide...
  • Page 63 If the wire harness is fine, replace the A1A3 Touch Screen Display. If the DC voltage on pin #20 does not measure at least +0.5 VDC, replace the A1A5 Front Panel Controller board. N9040B UXA Signal Analyzer Service Guide...
  • Page 64 A1A4 DC to DC Converter board to ground. This is the backlight enable control line for the backlight converter board. Does the DC voltage from pin #7 to ground measure at least +3 VDC? If yes: Proceed to the next step. N9040B UXA Signal Analyzer Service Guide...
  • Page 65 LED backlight of the display. Does the DC voltage from pin #2 to ground measure at least +25 VDC? If yes: Replace the A1A3 Touch Screen Display. If no: Replace the A1A4 DC to DC Converter board. N9040B UXA Signal Analyzer Service Guide...
  • Page 66: Initializations Did Not Complete

    If there are any error messages displayed at the bottom of the instrument screen once it completes the boot up process, refer to the X-Series Instrument Messages Guide for a description of the message. X-Series Instrument Messages Guide N9040B UXA Signal Analyzer Service Guide...
  • Page 67: Signal Level Problem With Input Frequencies < 3.6 Ghz

    It is possible that other input frequencies < 3.6 GHz could have an amplitude problem even though the 50 MHz calibrator is within tolerance. Using the internal RF calibrator provides a quick check of the low band path. N9040B UXA Signal Analyzer Service Guide...
  • Page 68: Signal Level Problem With Input Frequencies > 3.6 Ghz

    It is possible that other input frequencies > 3.6 GHz could have an amplitude problem even though the 4.8 GHz calibrator is within tolerance. Using the internal RF calibrator provides a quick check of the high band path. N9040B UXA Signal Analyzer Service Guide...
  • Page 69 Boot Up and Initialization Signal Level Verification N9040B UXA Signal Analyzer Service Guide...
  • Page 70: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Information and Calibration Data What You Will Find in This Chapter This chapter provides information on the following: Instrument Model Number on page 82 Instrument Serial Number on page 83 Instrument Licenses on page 84...
  • Page 71: Instrument Information And Calibration Data

    The model number of the instrument can be found on the instrument in three places. It is on the front panel nameplate, the rear panel label, and on the System Information screen in the instrument application software, as seen in Figure 3-1. Figure 3-1 System Information Screen N9040B UXA Signal Analyzer Service Guide...
  • Page 72: Instrument Serial Number

    The serial number of the instrument can be found on the instrument in two places. It is on the rear panel label, and on the System Information screen in the instrument application software, as seen in Figure 3-1. N9040B UXA Signal Analyzer Service Guide...
  • Page 73: Instrument Licenses

    As previously mentioned, most all licenses in the instrument are non-removable, except for measurement applications. If for some reason a non-removable license needs to be removed from an instrument, Keysight factory support will need to be contacted for assistance. N9040B UXA Signal Analyzer Service Guide...
  • Page 74: License Installation

    After installing a new license, the instrument application will need to be restarted for the licensed functionality to be activated. Licenses can also be installed by dropping them into the C:\Program Files\Agilent\Licensing folder. N9040B UXA Signal Analyzer Service Guide...
  • Page 75: Instrument Calibration Database

    Select OK to continue. Figure 3-3 Alignment Data Wizard - Application Shutdown 3. Once the instrument application shuts down, the wizard will continue with the prompt seen in Figure 3-4. Select Next. N9040B UXA Signal Analyzer Service Guide...
  • Page 76 4. You will then be presented with a selection to either Backup or Restore the calibration data, as seen in Figure 3-5. For this exercise select Backup and Next. Figure 3-5 Alignment Data Wizard - Select Operation N9040B UXA Signal Analyzer Service Guide...
  • Page 77 USB ports, select External Removable Drive, Browse to the drive, and select Save. Figure 3-6 Alignment Data Wizard - Backup Location 6. You will then need to confirm the Backup operation by selecting Save, as seen in Figure 3-7. N9040B UXA Signal Analyzer Service Guide...
  • Page 78 Instrument Calibration Database Figure 3-7 Alignment Data Wizard - Confirm Save 7. Once the backup of the database is complete select Finish, as seen in Figure 3-8. Figure 3-8 Alignment Data Wizard - Completed N9040B UXA Signal Analyzer Service Guide...
  • Page 79 Be sure to keep these two files together, as they will both be needed if you want to ever restore the database. The process for restoring a calibration database is very similar, just follow the on-screen prompts for that. N9040B UXA Signal Analyzer Service Guide...
  • Page 80: Internal Alignments

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide Internal Alignments What You Will Find in This Chapter This chapter provides information on the following: Internal Alignments Overview on page 92 When an Alignment Fails on page 93 Multiple Alignment Failures on page 94...
  • Page 81: Internal Alignments Overview

    Each of the alignments has a predetermined time and temperature interval at which they will be run. However, the Auto Align setting can either disable them or extend the time and temperature intervals at which they run. N9040B UXA Signal Analyzer Service Guide...
  • Page 82: When An Alignment Fails

    Then you can view the troubleshooting information for the A15 Front End Controller or deduce from the attenuator steps that fail, which attenuator is faulty. N9040B UXA Signal Analyzer Service Guide...
  • Page 83: Multiple Alignment Failures

    So, when looking at the alignment history for complicated failures it will often help to also look at alignments that passed to see if the data for certain conditions might give further indication of a failure trend. N9040B UXA Signal Analyzer Service Guide...
  • Page 84: Auto Alignment Descriptions

    The following information can be used to understand the workings of the internal alignments. It can also be used when there are multiple alignment failures to see what common settings or signal paths there may be between the failures. N9040B UXA Signal Analyzer Service Guide...
  • Page 85 AIF LC Narrow Prefilter Passband Fine Tuning A2 Analog IF Algorithm AIF Xtal Wide Prefilter Passband Tuning A2 Analog IF A3 Digital IF or Algorithm A16 Reference AIF Xtal Narrow Prefilter Passband Tuning A2 Analog IF Algorithm N9040B UXA Signal Analyzer Service Guide...
  • Page 86 40 MHz BW signal path, A2 Analog IF is not included in the signal path. DIF 40 Variable Attenuator Algorithm A3 Digital IF AIF 255 Variable Attenuator Alignment A21 Wide band A-IF Algorithm N9040B UXA Signal Analyzer Service Guide...
  • Page 87 AIF 255 UW Band 1 Chirp Cal Adjustment A21 Wideband Analog IF Algorithm Uses 4.8 GHz internal cal signal. Assure 4.8 GHz calibrator is present by viewing the calibrator on screen. Band 1 is > 3.6 GHz, high band path. N9040B UXA Signal Analyzer Service Guide...
  • Page 88 Preselector Two Point Tuning Algorithm A12 YTF Preselector A13 Front End A15 Front End Controller All Low Band High Band Nominal Path System Gain All Front End components 4800 MHz calibrator on A16 Algorithm Reference N9040B UXA Signal Analyzer Service Guide...
  • Page 89 NarrowBandIF is the standard 10 MHz IF or the 25 MHz path (B25) MediumBandIF is the 40 MHz IF path (B40) WideBandIF is the 255 MHz IF path (B2X) DualWideBandIF is the 510 MHz IF path (B5X) N9040B UXA Signal Analyzer Service Guide...
  • Page 90: First-Look Troubleshooting

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide First-Look Troubleshooting What You Will Find in This Chapter This chapter provides information on the following: Overview on page 102 Front Panel Troubleshooting on page 103 Overview on page 103 Initial Configuration Check on page 104...
  • Page 91: Overview

    The removal of the instrument outer cover, along with various inner sheet panel parts, will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 92: Front Panel Troubleshooting

    — Initial Configuration Check — Mechanical Attenuator Evaluation — A12 Yig Tuned Filter Shape Verification — µWave Signal Path Functionality — Preamplifier Functionality — IF Signal Path Isolation — IF Flatness Verification N9040B UXA Signal Analyzer Service Guide...
  • Page 93: Initial Configuration Check

    A21 Wideband Analog IF and the A22/A23 Wideband Digital IF assemblies. For a definition of the difference assembly names used in the Hardware Information screen as well as dependencies there might be for each assembly, Table 5-1. N9040B UXA Signal Analyzer Service Guide...
  • Page 94 IP address, options installed, etc... Access this screen by pressing System, Show System. This screen will resemble Figure 5-2. N9040B UXA Signal Analyzer Service Guide...
  • Page 95 You will also want to verify that the installed operating system matches the rear panel operating system certificate of authenticity, as the user could have installed something different, which could cause many different issues. N9040B UXA Signal Analyzer Service Guide...
  • Page 96 The Hardware Statistics screen should also be looked at to see what kind of use the instrument has seen. This is found by pressing System, Diagnostics, Show Hardware Statistics, as seen in Figure 5-3. Figure 5-3 Hardware Statistics Screen Contents N9040B UXA Signal Analyzer Service Guide...
  • Page 97 Both options can be found on the System, Alignments screen, as seen in Figure 5-4. Figure 5-4 Alignments Screen Contents N9040B UXA Signal Analyzer Service Guide...
  • Page 98: Mechanical Attenuator Evaluation

    Marker and then the Up Arrow four times. 12.Activate the marker delta function by pressing Marker Mode, Delta. 13.Return to the attenuator control menu by pressing Amplitude, Attenuation. 14.The screen should now look like Figure 5-5. N9040B UXA Signal Analyzer Service Guide...
  • Page 99 40 dB change in Figure 5-6. Figure 5-6 Mechanical Attenuator – 40 dB Change N9040B UXA Signal Analyzer Service Guide...
  • Page 100 Attenuator is stepping at the correct amount and the corrections are compensating for it accordingly. 19.If there is any problem found with the levels in this attenuator evaluation, see the appropriate RF Section Troubleshooting chapter to determine what the problem is. N9040B UXA Signal Analyzer Service Guide...
  • Page 101: A12 Yig Tuned Filter Shape Verification

    The IQ Analyzer application Complex Spectrum measurement has two displays by default – Spectrum and IQ Waveform. Double-tapping in the Spectrum display will maximize that display and hide the IQ Waveform display, making this Figure 5-8 measurement easier to evaluate, as seen in N9040B UXA Signal Analyzer Service Guide...
  • Page 102 Characterize Preselector. If the peak-to-peak variation within the ±15 MHz area is greater than expected, and the filter passband is centered in the display, the A12 Yig Tuned Filter will need to be replaced. N9040B UXA Signal Analyzer Service Guide...
  • Page 103: Μwave Path Functionality

    If the signal is there, but at a lower power level, try centering the A12 Yig Tuned Filter by pressing Amplitude, Signal Path, Presel Center. If the signal level comes up to the expected level, note the Presel Adjust value. N9040B UXA Signal Analyzer Service Guide...
  • Page 104 SW3 LNP Switch. 11.Bypass the A12 Yig Tuned Filter by pressing Amplitude, Signal Path, µWave Path Control, µW Presel Bypass. 12.There should be a signal at the center of the display at approximately -10 dBm. N9040B UXA Signal Analyzer Service Guide...
  • Page 105 13.If it was found that only one of the microwave signal paths has a problem, follow the instructions given to resolve that issue. If all the microwave signal paths appear the same, either good or bad, see “IF Signal Path Isolation” section for further fault isolation. N9040B UXA Signal Analyzer Service Guide...
  • Page 106: Preamplifier Functionality

    8. Change trace 1 to averaging by pressing Trace, Trace Type, Trace Average. 9. Turn trace 2 on by pressing Select Trace, Trace 2, Trace Type, Trace Average. 10.Allow the Avg/Hold to reach 100 then stop the trace 2 acquisition by pressing View/Blank, View. N9040B UXA Signal Analyzer Service Guide...
  • Page 107 View. 20.Reset the marker by pressing Marker, Marker Mode, Off, then Normal, then press the Up Arrow four times to move the marker to the first vertical graticule from the right of the display. N9040B UXA Signal Analyzer Service Guide...
  • Page 108 “A11 Low Band Switch” section in Chapter 7, “RF Section (RF/Microwave),” to determine why the high band preamplifier is not working properly. 25.Turn the high band preamplifier off by pressing Internal Preamp, Off. N9040B UXA Signal Analyzer Service Guide...
  • Page 109: If Signal Path Isolation

    7. Go to the Meas Setup, IF Path menu. 8. Cycle through the different IF Paths that are available in the IF Path selection, as seen in Figure 5-13, and note any signal level drop-outs. N9040B UXA Signal Analyzer Service Guide...
  • Page 110 IF Signal Path Isolation 9. If any problems are found after cycling through all the available IF Paths, refer to Table 5-3 to see what assemblies the problem paths have in common and proceed from there. N9040B UXA Signal Analyzer Service Guide...
  • Page 111: If Flatness Verification

    8. Set the trace average type to maximum by pressing Meas Setup, Avg Type, Maximum. 9. Slowly vary the frequency of the signal generator to draw the corrected IF response using mixers #1 and #2 on the display, as seen in Figure 5-14. N9040B UXA Signal Analyzer Service Guide...
  • Page 112 12.Restart the maximum trace by pressing Sweep, Restart. 13.Slowly vary the frequency of the signal generator to draw the uncorrected IF response using mixers #1 and #2 on the display, as seen in Figure 5-15. N9040B UXA Signal Analyzer Service Guide...
  • Page 113 IF Flatness On. 17.Tune the signal generator to 8 GHz. 18.Slowly vary the frequency of the signal generator to draw the corrected IF response using mixer #2 on the display, as seen in Figure 5-16. N9040B UXA Signal Analyzer Service Guide...
  • Page 114 IF Flatness Off. 21.Restart the maximum trace by pressing Sweep, Restart. 22.Slowly vary the frequency of the signal generator to draw the uncorrected IF response using mixer #2 on the display, as seen in Figure 5-17. N9040B UXA Signal Analyzer Service Guide...
  • Page 115 IF Flatness On. 26.Tune the signal generator to 20 GHz. 27.Slowly vary the frequency of the signal generator to draw the corrected IF response using mixer #5 on the display, as seen in Figure 5-18. N9040B UXA Signal Analyzer Service Guide...
  • Page 116 IF Flatness Off. 30.Restart the maximum trace by pressing Sweep, Restart. 31.Slowly vary the frequency of the signal generator to draw the uncorrected IF response using mixer #5 on the display, as seen in Figure 5-19. N9040B UXA Signal Analyzer Service Guide...
  • Page 117 32.The uncorrected frequency response for the 255 MHz IF path at 20 GHz should look similar to that seen in Figure 5-19. If it varies greatly from this, further troubleshooting will be needed to determine why. N9040B UXA Signal Analyzer Service Guide...
  • Page 118: Power Supply Verification

    +15 V Analog A6 Power Supply +32 V Analog A6 Power Supply -5.2 V Analog A7 Midplane Board DS14 -7 V Analog A6 Power Supply -15 V Analog A6 Power Supply A6 Power Supply N9040B UXA Signal Analyzer Service Guide...
  • Page 119 First-Look Troubleshooting Power Supply Verification Figure 5-20 Power Supply LED Locations – A7 Midplane Board Rear N9040B UXA Signal Analyzer Service Guide...
  • Page 120 Chapter 14, “Power Supply and Cooling Fans,” to determine why. If either of the two voltages regulated on the A7 Midplane board are not at the correct level, see Chapter 15, “Motherboards,” to determine why. N9040B UXA Signal Analyzer Service Guide...
  • Page 121 First-Look Troubleshooting Power Supply Verification N9040B UXA Signal Analyzer Service Guide...
  • Page 122: Block Diagrams

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide Block Diagrams What You Will Find in This Chapter The following block diagrams are found in this chapter: Option 508, 513, 526 Full System - Standard Swept Spectrum Analyzer Full System - Option B2X...
  • Page 123 N9040B – Option 508, 513, 526 Full System - Standard 10 MHz Analysis Bandwidth Front Panel Rear Panel RF Section From A15 FEC J801 From A15 FEC J801 Control Control -2 dB -30 dB SW2 MPB Switch SW2 MPB Switch...
  • Page 124 N9040B – Option 508, 513, 526 Instrument Setup Swept Spectrum Analyzer Mode Spectrum Analyzer Spectrum Analyzer Spectrum Analyzer Input Signal Path (2 Hz – 3.6 GHz) Input Port RF Input RF Input RF Input Center Frequency 20 GHz 8 GHz...
  • Page 125 N9040B – Option 508, 513, 526 Full System - Option B2X 255 MHz Analysis Bandwidth Front Panel Rear Panel RF Section From A15 FEC J801 From A15 FEC J801 Control Control -2 dB -30 dB SW2 MPB Switch SW2 MPB Switch...
  • Page 126 N9040B – Option 508, 513, 526 Instrument Setup IQ Analyzer - Option B2X Mode IQ Analyzer IQ Analyzer IQ Analyzer Input Signal Path (2 Hz – 3.6 GHz) Input Port RF Input RF Input RF Input Center Frequency 20 GHz...
  • Page 127 N9040B – Option 508, 513, 526 Full System - Option B5X 510 MHz Analysis Bandwidth Front Panel Rear Panel RF Section From A15 FEC J801 From A15 FEC J801 Control Control -2 dB -30 dB SW2 MPB Switch SW2 MPB Switch...
  • Page 128 N9040B – Option 508, 513, 526 Instrument Setup IQ Analyzer - Option B5X Mode IQ Analyzer IQ Analyzer IQ Analyzer Input Signal Path (2 Hz – 3.6 GHz) Input Port RF Input RF Input RF Input Center Frequency 20 GHz...
  • Page 129 N9040B – Option 544, 550 Full System - Standard 10 MHz Analysis Bandwidth Front Panel Rear Panel RF Section From A15 FEC J802 From A15 FEC J802 From A15 FEC J801 From A15 FEC J801 Control Control Control Control Reconstruction...
  • Page 130 N9040B – Option 544, 550 Instrument Setup Swept Spectrum Analyzer Mode Spectrum Analyzer Spectrum Analyzer Spectrum Analyzer Spectrum Analyzer Input Signal Path (10 Hz – 3.6 GHz) Input Port RF Input RF Input RF Input RF Input Center Frequency 50 GHz...
  • Page 131 N9040B – Option 544, 550 Full System - Option B2X 255 MHz Analysis Bandwidth Front Panel Rear Panel RF Section From A15 FEC J802 From A15 FEC J802 From A15 FEC J801 From A15 FEC J801 Control Control Control Control...
  • Page 132 N9040B – Option 544, 550 Instrument Setup IQ Analyzer - Option B2X Mode IQ Analyzer IQ Analyzer IQ Analyzer IQ Analyzer Input Signal Path (10 Hz – 3.6 GHz) Input Port RF Input RF Input RF Input RF Input Center Frequency...
  • Page 133 N9040B – Option 544, 550 Full System - Option B5X 510 MHz Analysis Bandwidth Front Panel Rear Panel RF Section From A15 FEC J802 From A15 FEC J802 From A15 FEC J801 From A15 FEC J801 Control Control Control Control...
  • Page 134 N9040B – Option 544, 550 Instrument Setup IQ Analyzer - Option B5X Mode IQ Analyzer IQ Analyzer IQ Analyzer IQ Analyzer Input Signal Path (10 Hz – 3.6 GHz) Input Port RF Input RF Input RF Input RF Input Center Frequency...
  • Page 135 N9040B Instrument Setup Swept Spectrum Analyzer – External Mixing Mode Spectrum Analyzer Input Port Ext Mixer Combined IF and LO Signal Path Mixer Single Harmonic with Doubler – W-Band 10 MHz Analysis Bandwidth Start Frequency 75 GHz IF Signal Path...
  • Page 136: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide RF Section (RF/Microwave) What You Will Find in This Chapter The following information is found in this chapter: 1. Theory of operation of the RF section. 2. Isolating the cause of an hardware problem by verifying the functionality of assemblies in the RF section signal path.
  • Page 137: Rf Section (Rf/Microwave)

    Spectrum Analyzer or IQ Analyzer 25 MHz (Option B25) 322.5 MHz IQ Analyzer 40 MHz (Option B40) 250 MHz IQ Analyzer 255 MHz (Option B2X) 750 MHz IQ Analyzer 510 MHz (Option B5X) 877 MHz IQ Analyzer N9040B UXA Signal Analyzer Service Guide...
  • Page 138 A13A1J7. This signal path is used for all frequency range options when the RF input frequencies are < 3600 MHz. The control voltages and biasing for these assemblies come from the A15 Front End Control assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 139: A9 Input Attenuator A

    Low Band Switch assembly. There is a 6 dB, 10 dB, 20 dB, and 30 dB section in the A10 assembly. Total input attenuation with the A9 and the A10 combined is 70 dB in 2 dB steps. N9040B UXA Signal Analyzer Service Guide...
  • Page 140: A11 Low Band Switch

    The 1st LO has a frequency range from 3.50 to 9 GHz. The output power is +13 to +18 dBm. In order to maximize the conversion efficiency and avoid LO unlock, sufficient LO power must be supplied. N9040B UXA Signal Analyzer Service Guide...
  • Page 141: A13 Rf Front End Assembly

    A13A2 contains the switched filters and LO and IM nulling circuits. A13A1 and A13A2 are not separately replaceable. The entire A13 assembly must be replaced. See Figure 7-1. Figure 7-1 A13 RF Front End Assembly N9040B UXA Signal Analyzer Service Guide...
  • Page 142 — Front End Assembly including switched filter — (Optional) High Band Preamplifier — (Optional) Low Band Preamplifier — (Option EA3) Electronic Attenuator (0-24 dB) For detailed descriptions & troubleshooting procedures refer to Chapter 9, “Front End Control.” N9040B UXA Signal Analyzer Service Guide...
  • Page 143: Troubleshooting

    “Quick Check to Verify High Band RF Path” on page 165. If the power level is not within tolerance, press FREQ (Channel), Toggle Swept Span to Zero Span, AMPTD (Y Scale), Attenuation, 10 dB. N9040B UXA Signal Analyzer Service Guide...
  • Page 144 Disconnect the W16 cable from A15J902 on the Front End Controller IF IN. The end of W16 cable is easily accessed from the top of the instrument (See Figure 7-2. Figure 7-2 W16 at Front End Controller N9040B UXA Signal Analyzer Service Guide...
  • Page 145 Reconnect the W16 cable to A15J902. Flatness issues or power level problems at other input frequencies below 3600 MHz may exist. This type of problem can be diagnosed using an external source to verify performance N9040B UXA Signal Analyzer Service Guide...
  • Page 146 In order to gain access to the front end components, remove the front frame assembly, but leave the ribbon cable connected so you can still control the instrument. Remove the right side chassis. Refer to the removal procedures in Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 147: Troubleshooting A Low Band Problem

    Low Band output at W8 is incorrect, suspect the A11 Low Band Switch, the interconnect cables, Switch 3 if Option LNP is present, or the control signals. The control signals are explained in Chapter 9, “Front End Control”, on page 201. N9040B UXA Signal Analyzer Service Guide...
  • Page 148 RF Section (RF/Microwave) Troubleshooting Figure 7-4 RF Section N9040B UXA Signal Analyzer Service Guide...
  • Page 149 Both set to through path −2 −4 −6 A9 set to 2 dB, −8 A10 set to 6 dB −10 −20 −30 −40 −50 −60 A9 set to 4 dB, −70 A10 set to 66 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 150 Connect the measuring spectrum analyzer to the other arm of the splitter. Add the loss through the splitter arm which is 6 dB for the Keysight 11667B splitter. N9040B UXA Signal Analyzer Service Guide...
  • Page 151 Boot Up and Initialization Troubleshooting chapter. Viewing the Alignment History file will tell you if other alignment tests failed, and reveal which electronic attenuator steps failed. N9040B UXA Signal Analyzer Service Guide...
  • Page 152 Assure you have evaluated all causes before you replace the Front End assembly. If you determine the problem is at a frequency other than 50 MHz, perform the low band flatness adjustment before replacing the Front End assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 153 RF is the input signal at the signal analyzer Low Band second mixer: RF = LO + IF IF = RF − LO LO = RF − IF where RF in this case is the first IF signal (signal at A13A1J11) N9040B UXA Signal Analyzer Service Guide...
  • Page 154: Quick Check To Verify High Band Rf Path

    50 MHz. Since several of the same signal path components are shared between high band and low band, determining if the problem appears in both paths is helpful Turn off auto align by pressing System, Alignments, Auto Align, Off. IMPORTANT N9040B UXA Signal Analyzer Service Guide...
  • Page 155 RF Section (RF/Microwave) Troubleshooting Disconnect cable W16 at A15J902, 322.5 MHz output on the A15 Front End Controller. See Figure 7-7. Select Span, 0 Hz. Figure 7-7 A15J902 Location (Options 508, 513, and 526) N9040B UXA Signal Analyzer Service Guide...
  • Page 156 1. A11 Low Band Switch 2. A10 Input Attenuator B 3. A9 Input Attenuator A 4. A16 Reference Assembly (4.8 GHz calibrator) 5. A20 YTO 6. A12 YTF Preselector 7. A13 Front End Assembly N9040B UXA Signal Analyzer Service Guide...
  • Page 157 In order to gain access to the front end components, remove the side chassis (1) by removing the eleven screws (2) (0515-0372) and the two screws (3) (0515-1946). See Figure 7-9. Figure 7-9 Remove the Side Chassis N9040B UXA Signal Analyzer Service Guide...
  • Page 158: Troubleshooting A High Band Problem

    If the signal level is incorrect, press AMPTD (Y Scale), Signal Path, uWPath Control, uW Preselector Bypass. If the signal level is now −52 dBm, suspect the A12 YTF is out of adjustment or faulty. N9040B UXA Signal Analyzer Service Guide...
  • Page 159 4.8 GHz and −25 dBm to the RF input connector of analyzer under test. Press Input/Output, RF Calibrator, Off. If the signal level at the attenuator output is now correct, suspect the A9 Attenuator cal switch or a faulty control signal from the A15 Front End Controller assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 160 Both set to through path −2 −4 −6 A9 set to 2 dB, −8 A10 set to 6 dB −10 −20 −30 −40 −50 −60 A9 set to 4 dB, −70 A10 set to 66 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 161 Measuring Setup The signal should be 5122.5 MHz at +7 dBm ± 3 dB because of the 6 dB loss through the 11667B splitter. The output power from A20 is 5122.5 MHz at +13 dBm. N9040B UXA Signal Analyzer Service Guide...
  • Page 162 (using the calibration software) will adjust the preamp on, high band path. Assure you have evaluated all causes including A15 Front End Controller switching problems, before you replace the Front End assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 163 Depending on the signal source connected, you may see many “signals” appear on screen because without preselection, the analyzer will display images and multiples. The real input signal should not change amplitude when you switch the uW Preselector Bypass on and off. N9040B UXA Signal Analyzer Service Guide...
  • Page 164: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide RF Section (Millimeter-Wave) What You Will Find in This Chapter The following information is found in this chapter: 1. Theory of operation of the RF section. 2. Isolating the cause of an hardware problem by verifying the functionality of assemblies in the RF section signal path.
  • Page 165: Rf Section (Millimeter-Wave)

    IQ Analyzer 255 MHz (Option B2X) 750 MHz IQ Analyzer 510 MHz (Option B5X) 877.148 MHz IQ Analyzer 750 MHz IQ Analyzer 1 GHz (Option H1G) a. Requires Option 550, 50 GHz Frequency Range N9040B UXA Signal Analyzer Service Guide...
  • Page 166 4800 MHz (2nd LO)). The 2nd IF output is at A13A1J7. This signal path is used for all frequency range options when the RF input frequencies are < 3600 MHz. The control voltages and biasing for these assemblies come from the A15 Front End Control assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 167: A9 Input Attenuator A

    Low Band Switch assembly. There is a 10 dB, 20 dB, and 30 dB section in the A10 assembly. Total input attenuation with the A9 and the A10 combined is 70 dB in 2 dB steps. N9040B UXA Signal Analyzer Service Guide...
  • Page 168: A11 Low Band Switch

    The 1st LO has a frequency range from 3.80 to 8.73 GHz. The output power is +13 to +18 dBm. In order to maximize the conversion efficiency and avoid LO unlock, sufficient LO power must be supplied. N9040B UXA Signal Analyzer Service Guide...
  • Page 169: A13 Rf Front End Assembly (Options 544, 550)

    A13A2 contains the switched filters and LO and IM nulling circuits. A13A1 and A13A2 are not separately replaceable. The entire A13 assembly must be replaced. See Figure 8-1. Figure 8-1 A13 RF Front End Assembly View from Front Panel N9040B UXA Signal Analyzer Service Guide...
  • Page 170 — Front End Assembly including switched filter — (Optional) High Band Preamplifier — (Optional) Low Band Preamplifier — (Option EA3) Electronic Attenuator (0-24 dB) Refer to Chapter 9, “Front End Control” for detailed descriptions & troubleshooting procedures N9040B UXA Signal Analyzer Service Guide...
  • Page 171: Troubleshooting

    To verify the high band path go to “Quick Check to Verify High Band RF Path” on page 191. If the power level is not within tolerance, press SPAN (X Scale), Zero Span, AMPTD (Y Scale), Attenuation, 10 dB. N9040B UXA Signal Analyzer Service Guide...
  • Page 172 Reconnect the W16 cable to A13A1J7. Flatness issues or power level problems at other input frequencies below 3600 MHz may exist. This type of problem can be diagnosed using an external source to verify performance. N9040B UXA Signal Analyzer Service Guide...
  • Page 173 In order to gain access to the front end components, remove the front frame assembly, but leave the ribbon cable connected so you can still control the instrument. Remove the right side chassis. Refer to the removal procedures in Chapter 20, “Assembly Replacement Procedures”. N9040B UXA Signal Analyzer Service Guide...
  • Page 174: Troubleshooting A Low Band Problem

    Low Band output at W8 is incorrect, suspect the A11 Low Band Switch, the interconnect cables, Switch 3, or the control signals. The control signals are explained in Chapter 9, “Front End Control.” Figure 8-3 RF Section Assembly Locations (Options 544 and 550) N9040B UXA Signal Analyzer Service Guide...
  • Page 175 RF Section (Millimeter-Wave) Troubleshooting Figure 8-4 RF Section Cable Locations (Options 544 and 550) N9040B UXA Signal Analyzer Service Guide...
  • Page 176 Output Port (dBm) (Options 544, and 550) 0 dBm (reference) Both set to through path −2 −4 −6 −8 −10 −20 −30 −40 −50 −60 −70 A9 set to 10 dB, A10 set to 60 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 177 W48, the W28 ribbon cable must be reinstalled, and only then can the analyzer be powered back up. The ribbon cable is fragile so it cannot be bent out of the way to access the cable, and should not be removed and installed with power applied. N9040B UXA Signal Analyzer Service Guide...
  • Page 178 Set up the analyzer to view the 50 MHz calibrator signal on screen Press AMPTD, Attenuation, and verify that the Enable Elec Atten key is set to Off. It is not possible to turn on both the electronic attenuator and preamp at the same time. N9040B UXA Signal Analyzer Service Guide...
  • Page 179 RF is the input signal at the signal analyzer Low Band second mixer: RF = LO + IF IF = RF − LO LO = RF − IF where RF in this case is the first IF signal (signal at A13A1J11) N9040B UXA Signal Analyzer Service Guide...
  • Page 180: Quick Check To Verify High Band Rf Path

    50 MHz. Since several of the same signal path components are shared between high band and low band, determining if the problem appears in both paths is helpful. Turn off auto align by pressing System, Alignments, Auto Align, Off. IMPORTANT N9040B UXA Signal Analyzer Service Guide...
  • Page 181 RF Section (Millimeter-Wave) Troubleshooting Disconnect cable W16 at A13A1J7, 322.5 MHz output on the Front End Assembly. See Figure 8-5. Select Span, 0 Hz. Figure 8-5 A13A1J7 Location (Options 544 and 550) N9040B UXA Signal Analyzer Service Guide...
  • Page 182 1. A11 Low Band Switch 2. A10 Input Attenuator B 3. A9 Input Attenuator A 4. A16 Reference Assembly (4.8 GHz calibrator) 5. A20 YTO 6. A12 YTF Preselector 7. A13 Front End Assembly N9040B UXA Signal Analyzer Service Guide...
  • Page 183 YTF Preselector adjust should be performed first before changing the A13 RF Front End Assembly. In order to gain access to the front end components, remove the side chassis. N9040B UXA Signal Analyzer Service Guide...
  • Page 184: Troubleshooting A High Band Problem

    To perform the YTF alignment, reconnect W62, and press System, Alignments, More, Advanced, Characterize Preselector. The routine may take several minutes to align the YTF. Display the 4.8 GHz calibrator signal on N9040B UXA Signal Analyzer Service Guide...
  • Page 185 4.8 GHz and −25 dBm to the RF input connector of analyzer under test. Press Input/Output, RF Calibrator, Off. If the signal level at the attenuator output is now correct, suspect the A9 Attenuator cal switch or a faulty control signal from the A15 Front End Controller assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 186 To assure the first LO is tuned to the correct frequency and power, measure the A14 DDS LO Synthesizer assembly at A14J1 when the analyzer center frequency is 4.8 GHz. The LO signal should measure 5122.5 MHz at +15 dBm ± 3 dB. N9040B UXA Signal Analyzer Service Guide...
  • Page 187 (using the calibration software) will adjust the preamp on, high band path. Assure you have evaluated all causes including A15 Front End Controller switching problems, before you replace the Front End assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 188 “signals” appear on screen because without preselection, the analyzer will display images and multiples. The real input signal should not change amplitude when you switch the uW Preselector Bypass on and off. N9040B UXA Signal Analyzer Service Guide...
  • Page 189 RF Section (Millimeter-Wave) Troubleshooting N9040B UXA Signal Analyzer Service Guide...
  • Page 190: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide Front End Control What You Will Find in This Chapter The following information is presented in this chapter: 1. Theory of operation of the Front End Control section. 2. Isolating the cause of a hardware problem by verifying the functionality of assemblies of the Front End Control.
  • Page 191: Front End Control

    The A15 Front End Controller board functionality can be broken down into (3) main categories 1. Provides switch control logic and bias voltages to the major RF front end assemblies in the N9040B Signal Analyzer. 2. Contains on board circuitry providing various signal outputs to other locations within the analyzer.
  • Page 192 A15 to Aux IF Output (rear panel) Low Noise Path A15 to SW3 Microwave Preselector Bypass A15 to SW1 and SW2 (Opt 508, 513, or 526) Electronic Attenuator A15 to A13 Figure 9-1 A15 Front View, Physical Connectors N9040B UXA Signal Analyzer Service Guide...
  • Page 193 R.F. Front End Logic Out To A13 J302 Preselector Tune Out N/A (test point only) J300 YTF Bias Control Out To A12 J802 Low Noise Bypass Switch Logic Out To SW3 (Option LNP) J100 Motherboard Connector From A8 N9040B UXA Signal Analyzer Service Guide...
  • Page 194: A15 Front End Control Assembly Troubleshooting

    N9040B, UXA Signal Analyzer due to the additions of front end assemblies. The troubleshooting board kit part number is N9020-60005 and includes the troubleshooting board and required interconnect cables.
  • Page 195: Verifying Input Attenuator A, Input Attenuator B, Low Band Switch Logic And Power Supplies

    508, 513, or 526 4. If the UXA has frequency range option 508, 513, or 526, also connect the Low Band Switch Control Cable, E4410-60160 between A15J700 and J2 of the RF Front End Troubleshooting board. N9040B UXA Signal Analyzer Service Guide...
  • Page 196 Front End Control A15 Front End Control Assembly Troubleshooting Figure 9-3 RF Front End Troubleshooting Board N9040B UXA Signal Analyzer Service Guide...
  • Page 197 7. Turn Auto Align off by pressing System, Alignments, Auto Align, choose Off from the drop-down menu. Resistors on the test board can get very hot. Handle with care. N9040B UXA Signal Analyzer Service Guide...
  • Page 198 RF Coupling switch to DC (Direct Coupled) and verify DS14 turns off and DS11 turns on. Set the RF Coupling back to AC. If the LED’s are not toggling correctly, the most probably cause is the A15 Front End Controller. N9040B UXA Signal Analyzer Service Guide...
  • Page 199 A15 Front End Control Assembly is correct. If the LED's are not illuminating as expected, the most probable cause is the A15 Front End Control Assembly. Set the input attenuator back to 10 dB by pressing AMPTD, Attenuation, 10 dB on the analyzer. N9040B UXA Signal Analyzer Service Guide...
  • Page 200 Be sure to reconnect the UXA Low Band switch ribbon cable and the input attenuator ribbon that were originally plugged into the Front End Control board before testing the input attenuator and low band switch logic. N9040B UXA Signal Analyzer Service Guide...
  • Page 201: Preselector Tune Output

    Table 9-9 Preselector Tune Output Voltages (Option 508, 513, 526) Center Frequency ~ Tune Voltage Valid Frequency (GHz) (VDC) Range Option 1.55 508, 513, 526 10.0 3.12 513, 526 15.0 20.0 6.27 26.0 8.17 N9040B UXA Signal Analyzer Service Guide...
  • Page 202: Verifying Sw3 (Option Lnp Only)

    AMPTD, Signal Path, uW Path Control. Standard Path is the default. Select uW Preselector Bypass and you should hear a distinct “click” noise if the control logic from the A15 Front End Control board is getting to SW1 and SW2. N9040B UXA Signal Analyzer Service Guide...
  • Page 203: Rf Signal Tracing

    Controller board. This troubleshooting procedure provides the instrument setups to verify options CR3, CRP and ALV. Test the Aux I.F. output based on the options installed in the analyzer. Standard UXA No test to perform. N9040B UXA Signal Analyzer Service Guide...
  • Page 204: Verifying Option Cr3

    Connect the Aux I.F. Output on the rear panel to the RF Input of a functioning spectrum analyzer. If the A15 Front End Controller is switching the I.F. correctly, you should measure 322.5 MHz at −35 dBm ±3 dB as per Figure 9-5. Figure 9-5 322.5 MHz N9040B UXA Signal Analyzer Service Guide...
  • Page 205: Verifying Option Crp

    Arbitrary IF Freq and vary the I.F. from 10 MHz to 70 MHz in 500 kHz steps and measure the Aux IF output. The amplitude level should remain fairly flat across the entire arbitrary IF output range. Figure 9-6 70 MHz N9040B UXA Signal Analyzer Service Guide...
  • Page 206: Verifying Option Alv

    Reduce source output power to −20 dBm. Signal should now appear one division lower, and voltmeter should measure approximately 1.3 VDC. Reduce source output power to −30 dBm. Signal should now appear one division lower, and voltmeter should measure approximately 1.0 VDC. N9040B UXA Signal Analyzer Service Guide...
  • Page 207 Front End Control A15 Front End Control Assembly Troubleshooting N9040B UXA Signal Analyzer Service Guide...
  • Page 208: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 10 Analog and Digital IFs What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 220 Troubleshooting Equipment Required on page 222 A2 25 MHz Analog IF on page 223...
  • Page 209: Analog And Digital Ifs

    A2 25 MHz Analog IF 322.5 MHz A3 40 MHz Digital IF 22.5 MHz 40 MHz A3 40 MHz Digital IF 250 MHz a. The spectrum analyzer swept SA measurement uses the 10 MHz IF path. N9040B UXA Signal Analyzer Service Guide...
  • Page 210 The removal of the instrument outer cover along with various inner sheet metal parts will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 211: Troubleshooting Equipment Required

    Power Meter Minimum frequency range: 10 MHz to 26.5 GHz Minimum power level range: -50 dBm to +20 dBm Miscellaneous Oscilloscope: 500 MHz, 1 MΩ input Multimeter (Voltage and Resistance) Misc. cables and adapters N9040B UXA Signal Analyzer Service Guide...
  • Page 212: A2 25 Mhz Analog If

    From A16 Reference J711 W107 J601 22.5 MHz IF Output To A3 40 MHz Digital IF J19 W100 J820 Bias & Control From A3 40 MHz Digital IF J20 Figure 10-2 A2 25 MHz Analog IF Connections N9040B UXA Signal Analyzer Service Guide...
  • Page 213 The A2 25 MHz Analog IF will identify itself on the instrument Hardware Information screen as the Analog IF, as seen in Figure 10-3. Figure 10-3 Hardware Information Screen – A2 25 MHz Analog IF N9040B UXA Signal Analyzer Service Guide...
  • Page 214 10-4. It is also mixed with a 22.5 MHz signal to generate a 322.5 MHz calibrator signal. This assembly also contains one of the burst carrier triggers (BCT). The BCT on the A2 assembly is relatively narrowband. Other BCT circuits have a much wider bandwidth. N9040B UXA Signal Analyzer Service Guide...
  • Page 215: Functional Verification

    Before replacing any assembly due to a failure during the functional verification, be sure to verify that the instrument power supply is delivering all the required voltage levels. To do this, see the “Power Supply Verification” section in Chapter 5, “First-Look Troubleshooting.” N9040B UXA Signal Analyzer Service Guide...
  • Page 216 10-5, remove W36 from J300 of the A2 25 MHz Analog Figure 10-5 A2 25 MHz Analog IF Connections 7. Connect a spectrum analyzer to the loose end of W36. 8. Tune the spectrum analyzer to 300 MHz with a span of 10 MHz. N9040B UXA Signal Analyzer Service Guide...
  • Page 217 10 kHz Crystal Narrow Step Gain Amplifier 20.Set the resolution bandwidth to 10 MHz by pressing BW, Res BW 10 MHz. 21.Place a marker on the 22.5 MHz signal on the spectrum analyzer display. N9040B UXA Signal Analyzer Service Guide...
  • Page 218 30.Vary the frequency of the signal generator to draw out the shape of the filter on the spectrum analyzer display, as seen in Figure 10-6. Figure 10-6 A2 25 MHz Analog IF Filter Shape - 12 MHz N9040B UXA Signal Analyzer Service Guide...
  • Page 219 100 kHz 1 MHz Figure 10-8 75 kHz 10 kHz 500 kHz Figure 10-9 10 kHz 3 kHz 100 kHz Figure 10-10 Figure 10-7 A2 25 MHz Analog IF Filter Shape - 1 MHz N9040B UXA Signal Analyzer Service Guide...
  • Page 220 Analog and Digital IFs A2 25 MHz Analog IF Figure 10-8 A2 25 MHz Analog IF Filter Shape - 300 MHz Figure 10-9 A2 25 MHz Analog IF Filter Shape - 75 kHz N9040B UXA Signal Analyzer Service Guide...
  • Page 221 36.Set the span on the spectrum analyzer to 40 MHz. 37.Vary the frequency of the signal generator to draw out the shape of the filter on the spectrum analyzer display, as seen in Figure 10-11. N9040B UXA Signal Analyzer Service Guide...
  • Page 222 A2 25 MHz Analog IF Figure 10-11 A2 25 MHz Analog IF Filter Shape - 25 MHz 38.If the filter bandpass shape does not match what is expected, replace the A2 25 MHz Analog IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 223: A3 40 Mhz Digital If

    From A2 25 MHz Analog IF J601 W100 A2 Power and Control To A2 25 MHz Analog IF J820 Analog Card Cage Connector A24 Interconnect Board J3 PCI Card Cage Connector A24 Interconnect Board J4 N9040B UXA Signal Analyzer Service Guide...
  • Page 224 Analog and Digital IFs A3 40 MHz Digital IF Figure 10-12 A3 40 MHz Digital IF Connections - Bottom Figure 10-13 A3 40 MHz Digital IF Connections - Top N9040B UXA Signal Analyzer Service Guide...
  • Page 225 The A3 40 MHz Digital IF will identify itself on the instrument Hardware Information screen as the Digital IF, as seen in Figure 10-14. Figure 10-14 Hardware Information Screen – A3 40 MHz Digital IF N9040B UXA Signal Analyzer Service Guide...
  • Page 226 This reference signal is used to clock the 25 MHz ADC, is doubled to provide the clock for the 40 MHz ADC and is divided by 10 to provide the rear panel 10 MHz Reference output, as seen in Figure 10-15. N9040B UXA Signal Analyzer Service Guide...
  • Page 227: Functional Verification

    Before replacing any assembly due to a failure during the functional verification, be sure to verify that the instrument power supply is delivering all the required voltage levels. To do this, see the “Power Supply Verification” section in Chapter 5, “First-Look Troubleshooting.” N9040B UXA Signal Analyzer Service Guide...
  • Page 228 100 MHz reference signal at the reference input of the A3 40 MHz Digital IF. 9. Referring to Figure 10-16, remove W42 from the A3 40 MHz Digital IF 10/25 MHz input at J19. N9040B UXA Signal Analyzer Service Guide...
  • Page 229 15.Change the IF path to 40 MHz by pressing Meas Setup, IF Path, IF Path, 40 MHz. 16.Remove W26 from the A3 40 MHz Digital IF 40 MHz input at J15. N9040B UXA Signal Analyzer Service Guide...
  • Page 230 -10 dBm. If there is a signal on screen as expected, replace the A3 40 MHz Digital IF. If there is not a signal on screen as expected, replace the A4 System Processor assembly. N9040B UXA Signal Analyzer Service Guide...
  • Page 231 15.Vary the frequency of the signal generator between 10 and 35 MHz so that it draws out the IF frequency response of the 25 MHz IF path on the instrument screen, as seen in Figure 10-17. N9040B UXA Signal Analyzer Service Guide...
  • Page 232 22.Change the span to 40 MHz by pressing Frequency, Span 40 MHz. 23.Adjust the power level of the signal generator until the level of the signal on the screen is -10 dBm, ±0.25 dB. 24.Restart the maximum trace by pressing Restart. N9040B UXA Signal Analyzer Service Guide...
  • Page 233 If the maximum trace is as expected, the IF flatness of the A3 40 MHz Digital IF is as expected. If the maximum trace is not as expected, replace the A3 40 MHz Digital IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 234 If there is not a signal as expected, see Chapter 12, “Reference,” determine why there is a problem with the 100 MHz reference coming from J716 of the A16 Reference assembly. 6. Reconnect W39 to J14. 7. Restart the instrument application. N9040B UXA Signal Analyzer Service Guide...
  • Page 235 A3 40 MHz Digital IF Rear Panel Ports The SNS Series Noise Source and Noise Source Drive +28V ports will only be functional if the N9069EM0E Noise Figure Measurement Application is installed in the instrument. N9040B UXA Signal Analyzer Service Guide...
  • Page 236 If there is not a signal as expected, see the “100 MHz Reference Verification” section in this chapter to determine if there is a 100 MHz reference signal at the reference input of the A3 40 MHz Digital IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 237 SNS Series Noise Source Communication - Not Connected 6. Connect a known working SNS series noise source to the SNS Series Noise Source port. 7. The instrument will automatically load the noise source model number, serial number, and ENR data. N9040B UXA Signal Analyzer Service Guide...
  • Page 238 If the information from the noise source has been transferred to the instrument, the SNS Series Noise Source port is communicating properly. If the information from the noise source has not been transferred to the instrument, replace the A3 40 MHz Digital IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 239 6. Verify that there is a positive going pulse on the oscilloscope screen similar to what is seen in Figure 10-23. (It is normal for the pulse width to vary as the instrument sweeps). N9040B UXA Signal Analyzer Service Guide...
  • Page 240 Noise Source Drive +28 Volt Output If there is a positive pulse as expected, the Noise Source Drive +28 Volts is working as expected. If there is not a positive as expected, replace the A3 40 MHz Digital IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 241 11.Verify that the time in-between sweeps is now approximately one second. If the instrument is sweeping as expected, the Trigger 2 In port is working as expected. If the instrument is not sweeping as expected, replace the A3 40 MHz Digital IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 242 7. Set the Trigger 1 Out to be a TTL high level when sweeping by pressing Input/Output, Trigger Output, Trig 1 Out, Sweeping (HSWP). 8. Verify that there is a positive pulse on the oscilloscope screen as seen in Figure 10-24. N9040B UXA Signal Analyzer Service Guide...
  • Page 243 11.Verify that there is a positive pulse on the oscilloscope screen as seen in Figure 10-24. If there is a pulse as expected, the Trigger 2 Out port is working as expected. If there is not a pulse as expected, replace the A3 40 MHz Digital IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 244 300 kHz. 10.Set the peak of the signal to the reference level by pressing Peak Search, Marker ->, Mkr->Ref Lvl. 11.Verify that the signal on the instrument screen looks like that in Figure 10-25. N9040B UXA Signal Analyzer Service Guide...
  • Page 245 Figure 10-20. 14.Send the screen video to the Analog Out port by pressing Input/Output, Output, Analog Out, Screen Video. 15.Verify that there is a signal on the oscilloscope display that resembles that Figure 10-26. N9040B UXA Signal Analyzer Service Guide...
  • Page 246 A3 40 MHz Digital IF - Analog Output If there is a signal as expected, the Analog Out port is working as expected. If there is not a signal as expected, replace the A3 40 MHz Digital IF. N9040B UXA Signal Analyzer Service Guide...
  • Page 247 Analog and Digital IFs A3 40 MHz Digital IF N9040B UXA Signal Analyzer Service Guide...
  • Page 248: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 11 LO Synthesizer What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 260 Troubleshooting Equipment Required on page 261 A14 DDS LO Synthesizer on page 262...
  • Page 249: Lo Synthesizer

    The removal of the instrument outer cover along with various inner sheet metal parts will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 250: Troubleshooting Equipment Required

    Power Meter Minimum frequency range: 10 MHz to 40 GHz Minimum power level range: -50 dBm to +20 dBm Miscellaneous Multimeter (Voltage and Resistance) Directional Coupler: 3 to 9 GHz Misc. cables and adapters N9040B UXA Signal Analyzer Service Guide...
  • Page 251: A14 Dds Lo Synthesizer

    Hardware Information screen. The A14 DDS LO Synthesizer main assembly will identify as the LO DDS Synthesizer and the A14A1 DDS LO Reference will identify as the LO DDS Reference, as seen in Figure 11-3. N9040B UXA Signal Analyzer Service Guide...
  • Page 252 The different components that make up the A14 DDS LO Synthesizer can be seen in Figure 11-4. A replacement A14 DDS LO Synthesizer includes both the A14 and A14A1, but not FL1 or W32. Figure 11-4 A14 DDS LO Synthesizer Components N9040B UXA Signal Analyzer Service Guide...
  • Page 253 Figure 11-5 Figure 11-6. The instrument settings determine which one to use. Figure 11-5 A14 DDS LO Synthesizer Block Diagram – A20 Output Figure 11-6 A14 DDS LO Synthesizer Block Diagram - A14A1 Output N9040B UXA Signal Analyzer Service Guide...
  • Page 254 A20 Yig Tuned Oscillator output is used Fast Tuning Wide loop bandwidth for wide capture range Spur suppression is as good as the "Best Spurs" setting Auto Coupled in spans ≥ 83.2 MHz A20 Yig Tuned Oscillator output is used N9040B UXA Signal Analyzer Service Guide...
  • Page 255 4.350 to 9.150 GHz 750 MHz 8.4 to 17.1 GHz 4.575 to 8.925 GHz 750 MHz 17.1 to 34.5 GHz 4.4625 to 8.8125 GHz 750 MHz 34.5 to 50 GHz 4.40625 to 6.34375 GHz 750 MHz N9040B UXA Signal Analyzer Service Guide...
  • Page 256 The A14 DDS LO Synthesizer creates a 50 MHz clock from the 10 MHz system reference clock. The A14A1 DDS LO Reference creates a 100 MHz clock and a 50 MHz clock from the 10 MHz reference clock from the main Board. N9040B UXA Signal Analyzer Service Guide...
  • Page 257: Functional Verification

    Before replacing any assembly due to a failure during the functional verification, be sure to verify that the instrument power supply is delivering all the required voltage levels. To do this, see the “Power Supply Verification” section in Chapter 5, “First-Look Troubleshooting.” N9040B UXA Signal Analyzer Service Guide...
  • Page 258 Chapter 12, “Reference,” determine why there is a problem with the 7.2 GHz reference coming from J703 of the A16 Reference assembly. 9. Reconnect W31 to the input of FL1. 10.Restart the instrument application. N9040B UXA Signal Analyzer Service Guide...
  • Page 259 A14 DDS LO Synthesizer Output Connection 8. Connect a spectrum analyzer to the A14 DDS LO Synthesizer output at J1. 9. Tune the spectrum analyzer to a start frequency of 3.5 GHz and a stop frequency of 9 GHz N9040B UXA Signal Analyzer Service Guide...
  • Page 260 A14 DDS LO Synthesizer Typical Output - A20 If the power level is as expected, the synthesizer output power level when using the A20 Yig Tuned Oscillator is as expected. Proceed to the next step. N9040B UXA Signal Analyzer Service Guide...
  • Page 261 Figure 11-10 A14 DDS LO Synthesizer Typical Output - A14A1 DDS LO Reference If the power level is as expected, the synthesizer output power level when using the A14A1 DDS LO Reference as expected. N9040B UXA Signal Analyzer Service Guide...
  • Page 262 Selecting Best Close-In Phase Noise will turn the A20 Yig Tuned Oscillator off, and the instrument will then use the A14A1 DDS output as its LO. 10.Referring to Figure 11-11, remove W20 from the A20 Yig Tuned Oscillator output. N9040B UXA Signal Analyzer Service Guide...
  • Page 263 If there is a signal as expected, replace the A14 DDS LO Synthesizer. If there is not a signal as expected, replace the A20 Yig Tuned Oscillator. N9040B UXA Signal Analyzer Service Guide...
  • Page 264 LO band break and during retrace. If the instrument is in a narrow span with a very fast sweeptime it will appear to be on constantly, while it is actually switching on N9040B UXA Signal Analyzer Service Guide...
  • Page 265 A14A1 300 MHz clock comes from dividing the 7.2 GHz reference by 24 on the A14A1. A14 Main 10 MHz clock comes from the motherboard. A14 Main 50 MHz clock comes from multiplying the 10 MHz clock times 5 on the A14 main. N9040B UXA Signal Analyzer Service Guide...
  • Page 266: A20 Yig Tuned Oscillator

    To A14 DSS LO Synthesizer J2 Figure 11-13 A20 Yig Tuned Oscillator The A20 Yig Tune Oscillator will identify itself on the instrument Hardware Information screen as the YTO, as seen in Figure 11-14. N9040B UXA Signal Analyzer Service Guide...
  • Page 267 LO Synthesizer A20 Yig Tuned Oscillator Figure 11-14 Hardware Information Screen – A20 Yig Tuned Oscillator N9040B UXA Signal Analyzer Service Guide...
  • Page 268: Functional Verification

    Since the instrument communicates with the A20 Yig Tuned Oscillator through the A14 DDS LO Synthesizer, be sure that it is initializing properly and being recognized on the Hardware Information screen before replacing an A20 Yig Tuned Oscillator for not initializing properly. N9040B UXA Signal Analyzer Service Guide...
  • Page 269 5. Verify that the instrument is in spectrum analyzer mode by pressing Mode/Meas, Spectrum Analyzer, OK. 6. Return the instrument to a known state by pressing Mode Preset. 7. Turn the internal alignments off by pressing System, Alignments, Auto Align, Auto Align Off. N9040B UXA Signal Analyzer Service Guide...
  • Page 270 17.Verify that the power level across the frequency range covered is at least +8 dBm, as seen in Figure 11-16, with the reference level offset set to equal the coupling factor of the directional coupler used. N9040B UXA Signal Analyzer Service Guide...
  • Page 271 A20 Yig Tuned Oscillator Typical Output Power If the power level is as expected, the power level of the A20 Yig Tuned Oscillator is as expected. If the power level is not as expected, replace the A20 Yig Tuned Oscillator. N9040B UXA Signal Analyzer Service Guide...
  • Page 272: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 12 Reference What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 284 Troubleshooting Equipment Required on page 285 A16 Reference on page 286...
  • Page 273: Reference

    The removal of the instrument outer cover along with various inner sheet metal parts will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 274: Troubleshooting Equipment Required

    Spectrum Analyzer Minimum frequency range: 10 MHz to 10 GHz Power Meter Minimum frequency range: 10 MHz to 10 GHz Minimum power level range: -50 dBm to +20 dBm Miscellaneous Misc. cables and adapters N9040B UXA Signal Analyzer Service Guide...
  • Page 275: A16 Reference

    To A3 40 MHz Digital IF J14 J717 100 MHz Output Not Used J718 2.4 GHz Output To A21 Wideband Digital IF J4 J726 Step Cal Input From A3 40 MHz Digital IF J17 N9040B UXA Signal Analyzer Service Guide...
  • Page 276 — A16A3 Reference OCXO The location of these three components can be seen in Figure 12-2. The A16A3 Reference OCXO is the only one of these assemblies that can be replaced individually. Figure 12-2 A16 Reference Components N9040B UXA Signal Analyzer Service Guide...
  • Page 277 Reference Plus Main and the A16A2 Reference Daughter will identify as the Reference Plus Daughter, as seen in Figure 12-3. The A16A3 Reference OCXO will not identify on the Hardware Information screen. Figure 12-3 Hardware Information Screen – A16 Reference N9040B UXA Signal Analyzer Service Guide...
  • Page 278 Figure 12-4, and the destination of each low frequency reference signal is seen in Table 12-2. Figure 12-4 A16 Reference – Low Frequency References Block Diagram N9040B UXA Signal Analyzer Service Guide...
  • Page 279 A3 40 MHz Digital IF 100 MHz J717 Not Used 300 MHz J711 A2 25 MHz Analog IF 3rd LO 300 MHz Calibrator Signals 300 MHz Comb Generator 300 MHz High Frequency Signals Phase Lock Loop Reference N9040B UXA Signal Analyzer Service Guide...
  • Page 280 A block diagram of the high frequency reference generation section can be seen in Figure 12-5, and the destination of each high frequency reference signal is seen in Table 12-3. Figure 12-5 A16 Reference - High Frequency References Block Diagram N9040B UXA Signal Analyzer Service Guide...
  • Page 281 Sent To Used For 2400 MHz J718 A21 Wideband Digital IF Clock 4800 MHz J702 Multiple References and LO 4800 MHz Calibrator Signals 4.8 GHz Reference Signal 7200 MHz J703 A14A1 DDS LO Clock N9040B UXA Signal Analyzer Service Guide...
  • Page 282 A3 40 MHz Digital IF. A block diagram of the calibrator signals section can be seen in Figure 12-6, and the signals that can be routed to each of the two calibrator outputs can be seen in Table 12-4. Figure 12-6 A16 Calibrator Signals N9040B UXA Signal Analyzer Service Guide...
  • Page 283 The J701 calibrator output is routed to the A9 Step Attenuator when needed. The J705 calibrator output is routed to the A13 Front End Assembly where it can be switched into the circuit right before the low band 1st mixer. N9040B UXA Signal Analyzer Service Guide...
  • Page 284: Functional Verification

    Before replacing any assembly due to a failure during the functional verification, be sure to verify that the instrument power supply is delivering all the required voltage levels. To do this, see the “Power Supply Verification” section in Chapter 5, “First-Look Troubleshooting.” N9040B UXA Signal Analyzer Service Guide...
  • Page 285 11.Remove the spectrum analyzer from J716 and reconnect W39 to it. 12.Remove W36 from J711 of the A16 Reference. 13.Connect the spectrum analyzer to J711. 14.Tune the spectrum analyzer to 300 MHz with a span of 10 MHz. N9040B UXA Signal Analyzer Service Guide...
  • Page 286 If there is a signal as expected, proceed to the next step. If there is not a signal as expected, replace the A16 Reference assembly. 16.Remove the spectrum analyzer from J711 and reconnect W36 to it. 17.Restart the instrument application. N9040B UXA Signal Analyzer Service Guide...
  • Page 287 11.Remove the spectrum analyzer from J702 and reconnect W18 to it. 12.Remove W31 from J703 of the A16 Reference. 13.Connect the spectrum analyzer to J703. 14.Tune the spectrum analyzer to 7.2 GHz with a span of 10 MHz. N9040B UXA Signal Analyzer Service Guide...
  • Page 288 If there is a signal as expected, proceed to the next step. If there is not a signal as expected, replace the A16 Reference assembly. 22.Remove the spectrum analyzer from J718 and reconnect W34 to it. 23.Restart the instrument application. N9040B UXA Signal Analyzer Service Guide...
  • Page 289 Figure 12-10. Once the 50 MHz signal is captured on the spectrum analyzer display the rest of the alignment routine can be aborted by pressing Cancel (Esc). N9040B UXA Signal Analyzer Service Guide...
  • Page 290 18.Tune the spectrum analyzer to 4.8 GHz. 19.Turn the 4.8 GHz calibrator signal on by pressing Cal Source, 4.8 GHz. 20.Verify that there is a 4.8 GHz signal on the spectrum analyzer display at approximately -28 dBm. N9040B UXA Signal Analyzer Service Guide...
  • Page 291 If there is a signal as expected, proceed to the next step. If there is not a signal as expected, replace the A16 Reference assembly. 21.Remove the spectrum analyzer from J701 and reconnect W3 to it. N9040B UXA Signal Analyzer Service Guide...
  • Page 292 12-5, and the location of each can be seen Figure 12-12. Table 12-5 A16A2 Reference Daughter Status LEDs Description Color Normal State 2400 MHz Reference Low 2400 MHz Reference High 2400 MHz Reference Locked Green 2400 MHz Reference OK Green N9040B UXA Signal Analyzer Service Guide...
  • Page 293 DS6 - Yellow This LED will be on when the instrument power is first turned on. Once the FPGAs on the A16 Reference Daughter have properly loaded it will go off. N9040B UXA Signal Analyzer Service Guide...
  • Page 294 100 MHz oscillator phase lock loop is locked. DS9 - Green This LED should come on very shortly after the instrument power is turned on, as it indicates that the 10 MHz OCXO on the A16A3 Reference OCXO is alive. N9040B UXA Signal Analyzer Service Guide...
  • Page 295 Reference A16 Reference N9040B UXA Signal Analyzer Service Guide...
  • Page 296: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 13 System Processor and Disk Drive What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 308 A4 System Processor Assembly on page 309...
  • Page 297: System Processor And Disk Drive

    The removal of the instrument outer cover along with various inner sheet metal parts will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 298: A4 System Processor Assembly

    Show System as seen in Figure 13-2. An example of the rear panel of these A4 System Processor version can be seen in Figure 13-3 Figure 13-4. Figure 13-2 A4 System Processor Identification – System Information N9040B UXA Signal Analyzer Service Guide...
  • Page 299 One of the USB ports on the host controller located on the A4 System Processor assembly is routed to the A1A2 Front Panel Controller board for this use. This port is a High Speed USB 2.0 compliant port. N9040B UXA Signal Analyzer Service Guide...
  • Page 300 — 1 x High Speed USB 2.0 Type-A Host Port — LAN (RJ45) 10/100/1000 based-T Ethernet port — Mini DisplayPort Video Output — VGA Video Output — SD Memory Card Slot (Accessible only when A5 disk drive is removed) N9040B UXA Signal Analyzer Service Guide...
  • Page 301 The main purpose for the SD memory card is for instrument calibration database backup. While the SD memory card slot is available on the PC6 and PC8 version of the assembly, it is no longer being used on PCA and newer assemblies. N9040B UXA Signal Analyzer Service Guide...
  • Page 302 This is intended for use when the A5 disk drive assembly has been changed and the calibration database needs to be transferred to it. N9040B UXA Signal Analyzer Service Guide...
  • Page 303: Processor Battery

    If the instrument is having a problem booting up, but is functional enough to enter the BIOS Setup Utility you will want to verify that the BIOS settings have not been changed. N9040B UXA Signal Analyzer Service Guide...
  • Page 304 Load Defaults Load the BIOS default values by navigating to the Exit screen and select Restore Defaults or Load Setup Defaults, whichever is present. Once the defaults have been loaded select Save Changes and Exit. N9040B UXA Signal Analyzer Service Guide...
  • Page 305: A5 Disk Drive

    For information on how to backup this data see the section titled “Instrument Calibration Database” Chapter 3, “Instrument Information and Calibration Data.” N9040B UXA Signal Analyzer Service Guide...
  • Page 306: Partitioning

    This partition contains an image of the C: drive as it was when the instrument was shipped from the factory. To restore the C: drive using the image stored in this recovery partition see the “Instrument Image Recovery System” section later in this chapter. N9040B UXA Signal Analyzer Service Guide...
  • Page 307: Troubleshooting Software Related Issues

    “Instrument Image Recovery System” to reinstall the operating system and instrument application software as it was when it left the factory. For information on reloading the instrument software, see Chapter 23, “Instrument Software and FPGAs.” N9040B UXA Signal Analyzer Service Guide...
  • Page 308: Instrument Image Recovery System

    Using the Instrument Recovery System 1. Make sure the instrument is turned off. 2. Turn on the instrument. 3. After the Keysight Technologies screen is displayed, the windows boot manager screen as seen in Figure 13-8 will be displayed for 5 seconds.
  • Page 309 C: drive. 6. After exiting the Instrument Image Recovery System, the instrument will reboot a few times. 7. Update the instrument application software to the latest version by downloading it from the following location. https://www.keysight.com/find/uxa_software N9040B UXA Signal Analyzer Service Guide...
  • Page 310: Power Supply And Cooling Fans

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 14 Power Supply and Cooling Fans What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 322 A6 Power Supply on page 323 Overview on page 323...
  • Page 311: Overview

    The removal of the instrument outer cover along with various inner sheet metal parts will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 312: A6 Power Supply

    Type Voltage Reference Standby +5.1 V Standby DCOM +15 V Standby ACOM Digital +3.35 V Digital DCOM +5.1 V Digital DCOM +12 V Digital DCOM Analog +5.2 V Analog ACOM +9 V Analog ACOM N9040B UXA Signal Analyzer Service Guide...
  • Page 313 These are the +15 V Standby and the +5.1 V Standby supplies. These supplies are used by the instrument to keep certain circuits alive even when the power is turned off. N9040B UXA Signal Analyzer Service Guide...
  • Page 314 LINE_TRIGGER This is a TTL level signal that is synchronous to the AC line input. This signal is typically used in spectrum analyzers to trigger an instrument sweep synchronous to the AC power line. N9040B UXA Signal Analyzer Service Guide...
  • Page 315 The A6 Power Supply has no user replaceable fuse. While there is a fuse internal to the supply this is not meant for field replacement. If the internal fuse is blown, the power supply has experienced a major failure and must be replaced. N9040B UXA Signal Analyzer Service Guide...
  • Page 316: Functional Verification

    Do not remove the cover from the A6 Power Supply for any reason. There are no internal serviceable parts or fuses that can be replaced during servicing. The A6 Power Supply is replaced as a unit, no lower level part replacement is supported. N9040B UXA Signal Analyzer Service Guide...
  • Page 317 A6 Power Supply +32 V Analog A6 Power Supply -5.2 V Analog A7 Midplane Board DS14 TP21 -7 V Analog A6 Power Supply TP12 -15 V Analog A6 Power Supply TP13 A6 Power Supply N9040B UXA Signal Analyzer Service Guide...
  • Page 318 Power Supply and Cooling Fans A6 Power Supply Figure 14-3 A7 Midplane Power Supply Status LED and Test Point Location - Front Figure 14-4 A7 Midplane Power Supply Status LED and Test Point Location - Rear N9040B UXA Signal Analyzer Service Guide...
  • Page 319 The -5.2 V analog power supply is regulated on the A7 Midplane board from the -7 V analog supply that comes from the A6 Power Supply. If the -5.2 V is not working, first verify that the -7 V is working before replacing the A7 Midplane board. N9040B UXA Signal Analyzer Service Guide...
  • Page 320: Instrument Cooling Fans

    This is achieved using carefully designed and positioned heat sinks, heat pipes, and cooling fans. There are two large cooling fans in the instrument, as seen in Figure 14-5. Figure 14-5 Cooling Fans N9040B UXA Signal Analyzer Service Guide...
  • Page 321 The connections to the fans from the A7 Midplane board can be seen on Figure 14-6. Figure 14-6 A7 Midplane board Fan Connector Locations N9040B UXA Signal Analyzer Service Guide...
  • Page 322: Troubleshooting

    If there are any problems with the running of any of the instrument fans, see “Fan(s) Are Not Operating” section in Chapter 2, “Boot Up and Initialization,” to determine the cause of the problem. N9040B UXA Signal Analyzer Service Guide...
  • Page 323 Power Supply and Cooling Fans Instrument Cooling Fans N9040B UXA Signal Analyzer Service Guide...
  • Page 324: 15 Motherboards

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 15 Motherboards What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 336 A7 Midplane on page 337 Overview on page 337 Power Supply Voltages and Status LEDs on page 339...
  • Page 325: Overview

    The removal of the instrument outer cover along with various inner sheet metal parts will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 326: A7 Midplane

    A6 Power Supply B2 Fan Control A6 Power Supply A1A2 Front Panel Controller A4 System Processor A8 Motherboard A4 System Processor J920 A24 Interconnect A4 System Processor J921 A24 Interconnect Optional Hardware Not used N9040B UXA Signal Analyzer Service Guide...
  • Page 327 Motherboards A7 Midplane Figure 15-2 A7 Midplane Connector Locations - Back Figure 15-3 A7 Midplane Connector Locations - Front N9040B UXA Signal Analyzer Service Guide...
  • Page 328: Power Supply Voltages And Status Leds

    +32 V Analog A6 Power Supply Front -5.2 V Analog A7 Midplane Board DS14 TP21 Front -7 V Analog A6 Power Supply TP12 Back -15 V Analog A6 Power Supply TP13 Front A6 Power Supply Front N9040B UXA Signal Analyzer Service Guide...
  • Page 329 Motherboards A7 Midplane Figure 15-4 A7 Midplane Power Supply Status LED and Test Point Location - Back Figure 15-5 A7 Midplane Power Supply Status LED and Test Point Location - Front N9040B UXA Signal Analyzer Service Guide...
  • Page 330: Additional Power Supply Regulation

    The connections to the fans from the A7 Midplane board can be seen on Figure 15-6. Figure 15-6 A7 Midplane Board Fan Connector Locations N9040B UXA Signal Analyzer Service Guide...
  • Page 331: Jump Start Switch

    If for some reason any of these cannot be remembered by the instrument there could be a problem with this memory and the A7 Midplane board would need to be replaced. N9040B UXA Signal Analyzer Service Guide...
  • Page 332: 10 Mhz Clock Distribution

    If for some reason the level of the power supply related interference is higher than normal this circuitry, or the A6 Power Supply assembly, could be causing the problem. N9040B UXA Signal Analyzer Service Guide...
  • Page 333: A8 Motherboard

    Connects To A7 Midplane Board A7 Midplane Board A7 Midplane Board A15 Front End Controller A16 Reference Not Used Optional Hardware A14 DDS LO Synthesizer Not Used Not Used Figure 15-8 A8 Motherboard Connector Locations N9040B UXA Signal Analyzer Service Guide...
  • Page 334: A24 Interconnect Board

    Figure 15-9. Table 15-4 A24 Interconnect Board Connections Connector Connects To A7 Midplane Board A7 Midplane Board A3 40 MHz Digital IF A3 40 MHz Digital IF Figure 15-9 A24 Interconnect Board Connector Locations N9040B UXA Signal Analyzer Service Guide...
  • Page 335 Motherboards A24 Interconnect Board N9040B UXA Signal Analyzer Service Guide...
  • Page 336: Front Panel

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 16 Front Panel What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 348 A1A5 Front Panel Controller Board on page 351 A1A3 Touch Screen Display on page 353...
  • Page 337: Overview

    Figure 16-2 Figure 16-3. Starting with serial prefix MY/SG/US6442 the A1A5 DC to DC Converter board is no longer used. This function has been built into the newer A1A4 Touch Screen Displays. N9040B UXA Signal Analyzer Service Guide...
  • Page 338 Front Panel Overview Figure 16-2 A1 Front Panel Components - Serial Prefix >=MY/SG/US6442 Figure 16-3 A1 Front Panel Components - Serial Prefix <MY/SG/US6442 N9040B UXA Signal Analyzer Service Guide...
  • Page 339 The removal of the instrument outer cover along with various inner sheet metal parts will be required to access the internal test ports and cables referenced in the functional verification procedures. If instructions are needed for any of this, see Chapter 20, “Assembly Replacement Procedures.” N9040B UXA Signal Analyzer Service Guide...
  • Page 340: A1A5 Front Panel Controller Board

    Speaker To Speaker LCD Control To A1A3 Touch Screen Display A1W1 Backlight / Touch Control To A1A3 Touch Screen Display A1W3 MP6 J1 USB 2 High Power (1.5A) To Front Panel USB 2 Connector N9040B UXA Signal Analyzer Service Guide...
  • Page 341 Front Panel Overview Figure 16-4 A1A2 Front Panel Controller Connections – Back Side Figure 16-5 A1A2 Front Panel Controller Connections – Front Side N9040B UXA Signal Analyzer Service Guide...
  • Page 342: A1A3 Touch Screen Display

    From A1A5 Front Panel Controller J16 A1W3 a. From A1A4 DC to DC Converter J2 for serial prefix <MY/SG/US6442. b. A1W2 for serial prefix <MY/SG/US6442. Figure 16-6 A1A3 Touch Screen Display Connections - Serial Prefix >=MY/SG/US6442 N9040B UXA Signal Analyzer Service Guide...
  • Page 343 If there is a question as to whether the display is working or not, see the “Troubleshooting a Blank Display” section in Chapter 2, “Boot Up and Initialization,” to determine what the cause is. N9040B UXA Signal Analyzer Service Guide...
  • Page 344: A1A4 Dc To Dc Converter Board

    If there is a question as to whether the display backlight is working or not, see “Troubleshooting a Blank Display” section in Chapter 2, “Boot Up and Initialization,” to determine what the cause is. N9040B UXA Signal Analyzer Service Guide...
  • Page 345: Miscellaneous

    If either of the power status LEDs do not turn on, see the “Typical instrument boot-up process flow” section in Chapter 2, “Boot Up and Initialization,” determine why. N9040B UXA Signal Analyzer Service Guide...
  • Page 346: 17 Hardware Options

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 17 Hardware Options What You Will Find in This Chapter The following information is found in this chapter. A21 Wideband Analog IF Troubleshooting on page 359 A22 Wideband Digital IF Troubleshooting on page 365...
  • Page 347 A current list of all instrument options and retrofit requirements is available on the Keysight web site for the UXA signal analyzer at: https://www.keysight.com/find/UXA_upgrades N9040B UXA Signal Analyzer Service Guide...
  • Page 348: A21 Wideband Analog If Troubleshooting

    IF Output To A3 40 MHz Digital IF J15 ADC Data Output To A22 Digital IF J778 W56 & W57 Digital Card Cage To/From A8 Motherboard J10 Analog Card Cage To/From A8 Motherboard J8 N9040B UXA Signal Analyzer Service Guide...
  • Page 349 Figure 17-1 A21 Wideband Analog Block Diagram...
  • Page 350: A21 Wideband Analog If Assembly Theory Of Operation

    Manually troubleshoot the assembly is basically verifying the proper IF signal at J17 is present and at the proper level. In addition you will want to verify input and output levels of the various calibration and reference signals. N9040B UXA Signal Analyzer Service Guide...
  • Page 351: A21 Wideband Troubleshooting

    Peak Search on the analyzer. The marker readout should be 50 MHz at −25 dBm ±3 dB. See Figure 17-2. If this reference signal is measuring incorrectly, see Chapter 7, “RF Section (RF/Microwave)” in this service guide. Figure 17-2 50 MHz Signal N9040B UXA Signal Analyzer Service Guide...
  • Page 352 Chapter 7, “RF Section (RF/Microwave)” in this service guide. 9. Connect a known good spectrum analyzer to A21J3. Verify reference signal at 2400 MHz at a level of + 9 dBm. N9040B UXA Signal Analyzer Service Guide...
  • Page 353 Hardware Options A21 Wideband Analog IF Troubleshooting Figure 17-3 2400 MHz Signal N9040B UXA Signal Analyzer Service Guide...
  • Page 354: A22 Wideband Digital If Troubleshooting

    Wideband 255 MHz or 510 MHz path. Press Mode Setup, IF Path, 40 MHz. If the signal is now present, there is a likely failure of the A22 Wideband Digital IF or the A21 Wideband Analog IF N9040B UXA Signal Analyzer Service Guide...
  • Page 355: Option Rts, Real-Time I/Q Data Streaming

    IF assemblies), there will be two flex cables. Software Requirements The instrument must have the following options installed: — N9040B-RT1 or N9040B-RT2, Real Time Analysis — N9040B-RTS Real Time Data Streaming Press System, Show System and verify the options listed above are present.
  • Page 356: Functionality Check

    There is no easy way to determine if the I and Q data at the rear panel is correct. However if the instrument can complete the power on tests and alignments without an error, and you perform the functionality test above, Option RTS should be working correctly. Figure 17-4 Option RTS N9040B UXA Signal Analyzer Service Guide...
  • Page 357: Option H1G, 1 Ghz Analysis Bandwidth Assembly

    The entire assembly must be replaced because the interconnections are difficult to remove/attach and troubleshooting the individual board assemblies is very difficult due to packaging constraints and lack of test points. Therefore the entire assembly must be replaced. N9040B UXA Signal Analyzer Service Guide...
  • Page 358 Hardware Options Option H1G, 1 GHz Analysis Bandwidth Assembly Figure 17-5 Option H1G Block Diagram N9040B UXA Signal Analyzer Service Guide...
  • Page 359: Operation And Verification

    Set the analyzer center frequency to 4.8 GHz and the calibrator signal should appear on screen at about -28 dBm if the 1 GHz path is working correctly. See Figure 17-6. Figure 17-6 4.8 GHz Calibrator Signal N9040B UXA Signal Analyzer Service Guide...
  • Page 360 Set up the measuring spectrum analyzer as shown in Figure 17-7. Notice the 750 MHz signal measures -10 dBm. Figure 17-7 Spectrum Analyzer Connected to Rear Panel IF 2 Out N9040B UXA Signal Analyzer Service Guide...
  • Page 361: Advanced Troubleshooting

    8121-2608 or 8121-2027 (this is the W16, SMA to MMCX cable used in the UXA). Set the measuring signal analyzer to the setting shown in Figure 17-7. The signal amplitude at 750 MHz should be about -40 dBm as shown in Figure 17-8. N9040B UXA Signal Analyzer Service Guide...
  • Page 362 5. Assure the 100 MHz reference signal at about 13 dBm is present at the A16 Reference Assembly J706. 6. Measure IF2 Out on rear panel. Press Input/Output, Output, IF 2 Out and select On. The 750 MHz signal level should be about -20 dBm. N9040B UXA Signal Analyzer Service Guide...
  • Page 363 50 GHz UXA with Option B5X, and notice SW4, the BPF, and SW5. If the measurement at input frequency 1 GHz is incorrect, but the 5 GHz (or greater) input frequency measurement is correct, suspect a fault with the switches or band pass filter. N9040B UXA Signal Analyzer Service Guide...
  • Page 364: Service Menus

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 18 Service Menus What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 376 Service Menu Access on page 377 Service Menu on page 380...
  • Page 365: Overview

    The service menus are intended to allow the service technician to see behind some of the instrument settings, turn some of the corrections off to see raw instrument hardware performance, isolate alignment issues, run front panel display and keyboard tests, and so forth. N9040B UXA Signal Analyzer Service Guide...
  • Page 366: Service Menu Access

    Figure 18-1. Figure 18-1 Service Menu – Access Menu 2. Select Login and a keyboard will appear, as seen in Figure 18-2. Figure 18-2 Service Menu Keyboard Entry N9040B UXA Signal Analyzer Service Guide...
  • Page 367 18-3. Figure 18-3 Service Menu – Ready to Login 5. Press Login to access the service menu. 6. The service menu should now be accessible, as seen in Figure 18-4. Figure 18-4 Service Menu N9040B UXA Signal Analyzer Service Guide...
  • Page 368 Service Menus Service Menu Access 7. Note that in addition to what is seen on the service menu itself it says, “More Service & Diagnostic controls are available in the Meas Setup menu.” N9040B UXA Signal Analyzer Service Guide...
  • Page 369: Service Menu

    Figure 18-5. Figure 18-5 Service Menu - Service Alignments The Immediate Actions section will allow the running of pieces of the alignment system, as seen in Figure 18-6. Figure 18-6 Service, Alignment, Immediate Actions N9040B UXA Signal Analyzer Service Guide...
  • Page 370 The Show Software screen displays a long list of the revision information for Keysight internal software that comprises the embedded application and programmable hardware devices (FPGAs and PLDs), as seen in Figure 18-8. Figure 18-8 Show Software Information N9040B UXA Signal Analyzer Service Guide...
  • Page 371 Once all of the keys have been pressed and the knob has been turned in both directions a pass indicator will be displayed, as seen in Figure 18-10. N9040B UXA Signal Analyzer Service Guide...
  • Page 372 The test results will be stored at C:\Temp\DisplayTestResults.txt. Front Panel Touch Test Selecting the front panel display test will first bring up a window as seen in Figure 18-12. N9040B UXA Signal Analyzer Service Guide...
  • Page 373 Service Menu Figure 18-12 Front Panel Touch Test Follow the instructions given on the screen to complete the test. This will test the touch screen display functionality. The test results will be stored at C:\Temp\MultitouchTestResults.txt. N9040B UXA Signal Analyzer Service Guide...
  • Page 374: Timebase Dac

    This will generate a .csv file in the C:\Temp\AutogeneratedLocators folder of the instrument containing a complete list of all key presses available for the current mode and measurement. This was not put here as a tool needed to service the instrument. N9040B UXA Signal Analyzer Service Guide...
  • Page 375: Meas Setup Menu

    This function turns both the gain and video shift on or off but does not affect the temperature corrections. When set to off, it is possible to measure the raw frequency response of the instrument while maintaining the temperature corrections. N9040B UXA Signal Analyzer Service Guide...
  • Page 376 RF to IF Corrections is typically very small and can only be seen when using one of the wideband IF Paths. This setting is intended for use by the factory and development team. It has no real value for servicing the instrument in the field. N9040B UXA Signal Analyzer Service Guide...
  • Page 377: Lock & Lo

    Provides the ability to lock the Low Noise Path switch that is used in the μWave Path Control menu into the ON position, regardless of the state of the μWave Path Control menu or functions. The low noise path flatness corrections are applied. N9040B UXA Signal Analyzer Service Guide...
  • Page 378 2 will turn it back on. This can be used when testing the IF input of the Ext Mixer port. Mixing Modes Allows for the selection of the alternate mixing mode. Normal mixing mode is typically high side mixing and alternate mode is typically low side mixing. N9040B UXA Signal Analyzer Service Guide...
  • Page 379 Service Menus Meas Setup Menu N9040B UXA Signal Analyzer Service Guide...
  • Page 380: Replaceable Parts

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 19 Replaceable Parts What You Will Find in This Chapter The following information is found in this chapter: 1. Part number tables for assemblies, mechanical parts, cables, front panel connectors, and labels.
  • Page 381 Figure 19-28, “Chassis,” page 448 Figure 19-29, “Fan Hardware,” page 451 Figure 19-30, “Input Connector,” page 452 Figure 19-31, “Front Frame Parts - Shield Removed,” page 453 Figure 19-32, “Front Frame Exploded View,” page 455 N9040B UXA Signal Analyzer Service Guide...
  • Page 382: How To Order Parts

    — Description of where the part is located, what it looks like, and its function (if known) — Quantity required For a list of Keysight Technologies sales and service office locations, refer to “Contacting Keysight Technologies” on page N9040B UXA Signal Analyzer Service Guide...
  • Page 383: Replaceable Parts

    N9040-60130 Serial Prefix ≥ MY/SG/US6442 2090-1166 A1A4 Backlight DC to DC Converter Board 0950-5670 A1A5 Front Panel Controller Board N9040-63012 A1A6 Power Switch Keysboard N9040-63016 A1MP1 Main Keypad Light Color N9040-40003 Dark Color N9040-40009 N9040B UXA Signal Analyzer Service Guide...
  • Page 384 Front Panel Interface Board Shield N9040-00032 A1MP26 & Front Panel Interface Cable Loop Fasteners 0510-1303 MP27 A1W1 Cable Assembly, (Flex Circuit), Display to Front Panel Interface Board N9040-60024 A1W2 Cable Assembly, DC-DC Converter to Display N9040-60027 N9040B UXA Signal Analyzer Service Guide...
  • Page 385 Options PC6, PC6S - Windows 10 N9020-60381 Option PC8 - Windows 10 N9032-60039 Option PCA - Windows 10 N9032-60025 A5MP0 Disk Drive Tray Assembly Options PC6, PC6S, PC8 E6607-61820 A5MP1 Disk Drive Tray Options PC6, PC6S, PC8 W1312-40078 N9040B UXA Signal Analyzer Service Guide...
  • Page 386 N9020-60210 Options 544, 550 with Option B5X N9020-60218 Option 550 with Option H1G N9020-60259 Switch, Coax, 510 MHz Bandpass Filter Bypass Option B5X N1810-60102 Switch, Coax, 510 MHz Bandpass Filter Bypass Option B5X N1810-60102 N9040B UXA Signal Analyzer Service Guide...
  • Page 387 Option RTS N9020-60272 A28A1 EMI Gasket, Wideband Real-Time Streaming Board Option RTS N9020-20178 Attenuator, 6 dB Coax (connects to SW1 & W13) Options 508, 513, 526 08493-60026 B1, B2 W1312-60063 7.2 GHz Bandpass Filter 9135-6218 N9040B UXA Signal Analyzer Service Guide...
  • Page 388 < 5605 Options 508, 513, 526 N9040-00003 s/n prefix ≥ 5605 and < 5616, Options 508, 513, 526 N9040-00037 s/n prefix < 5616 Options 544 and 550 s/n prefix ≥ 5616 all frequency ranges N9040-00059 N9040B UXA Signal Analyzer Service Guide...
  • Page 389 < 5605 Options 508, 513, 526 N9040-00012 s/n prefix ≥ 5605 and all Options 544 and 550 N9040-00041 Bracket, Rear Brace s/n prefix < 5616 N9040-00009 s/n prefix ≥ 5616 N9040-00039 s/n prefix ≥ 5616 Option H1G N9040-00056 N9040B UXA Signal Analyzer Service Guide...
  • Page 390 N9040-00019 Bracket, SW1 & SW2 Main Options 508, 513, 526 N9040-00017 Bracket, Transfer Switches Option 544, 550 N9040-00028 Shield, YTO, Top N9020-00005 Shield, YTO, Bottom N9020-00006 Bracket, Flex Circuit Support Options B2X, B5X N9040-00025 N9040B UXA Signal Analyzer Service Guide...
  • Page 391 N9040-60047 Cable, Flex Circuit, A23 Wideband DIF J9000 to A28 Wideband DIF Extension Board J2 Option RTS with Option B5X N9040-60048 Cable, Wire harness, A15 Front End Controller J300 to A12 YTF J1 N9040-60033 N9040B UXA Signal Analyzer Service Guide...
  • Page 392 Cable, Coax, A3 40 MHz Digital IF J17 to A21 Wideband Analog IF J2 Options B2X and B5X 8121-1919 Cable, Coax, A16 Reference J726 to A21 Wideband Analog IF J1 Options B2X and B5X 8121-0152 N9040B UXA Signal Analyzer Service Guide...
  • Page 393 N9040-20108 Cable, Semi-rigid, SW1 MPB Switch Port II to A12 YTF Input Options 508, 513, 526 N9040-20033 Cable, Semi-rigid, AT1 6 dB Attenuator to SW2 MPB Switch Port I Options 508, 513, 526 N9040-20036 N9040B UXA Signal Analyzer Service Guide...
  • Page 394 Cable, Semi-rigid, SW3 LNP Switch Port 4 to A11 Band Switch J3 Options 544, 550 N9040-20106 Cable, Semi-rigid, SW3 LNP Switch Port 2 to SW1 MPB Switch Port C N9040-20029 Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 395 Cable, Semi-rigid, SW6 MPB Switch Port 2 to A13A1 Front End Assembly J9 Options 544, 550 N9040-20111 Cable, Semi-rigid, Rear Panel IF 2 OUT to IF 2 IN Serial Number < US57212008 Option H1G N9040-20065 N9040B UXA Signal Analyzer Service Guide...
  • Page 396 5041-9167 Dark Color 5041-7906 Bottom Feet Key Locks 5021-2840 Strap Handle Light Color E4400-60026 Dark Color N9040-60059 Front Frame Handles Light Color 5023-1399 Dark Color 5023-3074 Hole Plug, Nylon, for 0.5 D hole 6960-0149 N9040B UXA Signal Analyzer Service Guide...
  • Page 397 6960-0076 Impact Cover, Front Light Color N5245-40001 Dark Color N9040-40007 Impact Cover, Rear Light Color N5245-40002 Dark Color N9040-40008 Touch-up Paint, Phantom-Gray, 1-Oz Bottle 6010-3330 a. Does not include nameplate, See A1MP3 through A1MP8. N9040B UXA Signal Analyzer Service Guide...
  • Page 398 Table 19-2 Attaching Hardware Attach Part Number Type Tool Torque Analog IF Digital IF 0515-0372 M3 X 0.5 Torx T-10 9 inch-lbs (8 mm long) Attenuators Attenuator Bracket 2 per 0515-0372 M3 X 0.5 Torx T-10 9 inch-lbs (8 mm long) Attenuator Bracket Chassis 2 per...
  • Page 399 Table 19-2 Attaching Hardware Attach Part Number Type Tool Torque Digital I.F. Board Plate Digital I.F. Board 2190-0068 Washers 2950-0054 Nuts 5/8-inch 21 inch-lbs socket Digital I.F. Board Plate Digital I.F. Board Plate 0515-1940 M3 X 0.45 Torx T-8 6 inch-lbs LVDS Connector (6 mm long) Display...
  • Page 400 Table 19-2 Attaching Hardware Attach Part Number Type Tool Torque Front Frame Handles Front Frame 0515-2044 M4 X 0.7 Torx T-20 21 inch-lbs (10 mm long) Front Panel Controller Board Front Frame 0515-0372 M3 X 0.5 Torx T-10 9 inch lbs. (8 mm long) Front Panel Controller Board Front Frame...
  • Page 401 Table 19-2 Attaching Hardware Attach Part Number Type Tool Torque Cable Clamp (Fan) Fan Bracket 0515-0372 M3 X 0.5 Torx T-10 9 inch-lbs (8 mm long) Motherboard Bracket Chassis 0515-0372 M3 X 0.5 Torx T-10 9 inch-lbs (Front) (8 mm long) Rear Motherboard Rear Motherboard Bracket 0515-0372...
  • Page 402 Table 19-2 Attaching Hardware Attach Part Number Type Tool Torque Rear Frame Chassis Corners 0515-1946 M3 X 0.5 Torx T-10 9 inch-lbs (6 mm long) RF Front End Assembly Motherboard Bracket 0515-0372 M3 X 0.5 Torx T-10 9 inch-lbs (8 mm long) RF Side Bracket Chassis Base &...
  • Page 403 Table 19-2 Attaching Hardware Attach Part Number Type Tool Torque Transfer Switch Transfer Switch Bracket 0515-1934 M2.5 X 0.45 Torx T-8 6 inch-lbs (6 mm long) Transfer Switch Bracket Chassis 0515-0372 M3 X 0.5 Torx T-10 9 inch-lbs (8 mm long) Wideband Analog I.F.
  • Page 404: Hardware

    Replaceable Parts Hardware Figure 19-1 Major Assemblies N9040B UXA Signal Analyzer Service Guide...
  • Page 405 (Options B2X and B5X) Table 19-1 A14 L.O. Synthesizer Assembly N9020-60377 A21 Wideband Analog I.F. Assembly N9020-60043 A16 Reference Assembly N9020-60377 A15 Front End Controller N9020-60295 A27 H1G Assembly (Option H1G) N9040-60102 (not compatible with Option B5X) N9040B UXA Signal Analyzer Service Guide...
  • Page 406 Replaceable Parts Figure 19-2 External Hardware N9040B UXA Signal Analyzer Service Guide...
  • Page 407 3050-0893 Rear Feet light color 5041-9611 dark color 5041-7903 Dress Cover light color N9040-00015 dark color N9040-00046 Bottom feet light color 5041-9167 dark color 5041-7906 Front Frame Handles light color 5023-1399 dark color 5023-3074 N9040B UXA Signal Analyzer Service Guide...
  • Page 408 N9040-00049 Top Brace Front Card Cage s/n prefix < 5605 Options 508, 513, 526 N9040-00010 s/n prefix ≥ 5605 and all Options 544 and 550 N9040-00055 Screw 0515-0372 3, 4, 6, 7 Screw 0515-1946 N9040B UXA Signal Analyzer Service Guide...
  • Page 409 Replaceable Parts Figure 19-4 RF Area (Options 508, 513, 526) N9040B UXA Signal Analyzer Service Guide...
  • Page 410 A11 Low Band Switch Assembly E4410-60121 SW3 Transfer Switch Assembly 87222-60026 SW1 and SW2 Coax Switches N1810-60069 J1 RF Input Connector Type-N N9039-60030 3.5 mm (Option C35) N9020-60196 A12 YTF Preselector 5087-7382 A20 YTO N9020-60009 N9040B UXA Signal Analyzer Service Guide...
  • Page 411 Figure 19-9 for locations of RF area cables for Options 508, 513, and 526. Figure 19-5 RF Area Cables (Options 508, 513, 526) Figure 19-6 Low Band Switch Cables (Options 508, 513, 526) N9040B UXA Signal Analyzer Service Guide...
  • Page 412 Replaceable Parts Figure 19-7 MPB/LNP Cables (Options 508, 513, 526) Figure 19-8 RF Front End Cables (Options 508, 513, 526) N9040B UXA Signal Analyzer Service Guide...
  • Page 413 Replaceable Parts Figure 19-9 RF Front End Side Cables (Options 508, 513, 526) N9040B UXA Signal Analyzer Service Guide...
  • Page 414 Cable, Semi-rigid, SW4 Filter Switch Port II to A13A2 Switch IF Filter J2 N9020-20267 Cable, Semi-rigid, SW4 Filter Switch Port I to FL2 Bandpass Filter Input N9020-20268 Cable, Semi-rigid, FL2 Bandpass Filter Output to SW5 Filter Switch Port I N9020-20269 N9040B UXA Signal Analyzer Service Guide...
  • Page 415 Cable, Semi-rigid, SW5 Filter Switch Port C to A13A1 Front End Assembly N9020-20265 Cable, Semi-rigid, A13A1 Front End Assembly J10 to SW4 Filter Switch N9020-20266 Port C Cable, Semi-rigid, A13A1 Front End Assembly J3 to A13A2 Switched IF N9020-20245 Filter J6 N9040B UXA Signal Analyzer Service Guide...
  • Page 416 Replaceable Parts Figure 19-10 RF Area (Options 544, 550) N9040B UXA Signal Analyzer Service Guide...
  • Page 417 Option 550 with Option H1G N9020-60259 A11 Low Band Switch Assembly N9020-60368 SW3 Transfer Switch Assembly 87222-60029 SW6 Transfer Switch Assembly 87222-60031 J1 RF Input Connector 2.4 mm N9030-60011 A12 YTF Preselector 5087-7383 A20 YTO N9020-60009 N9040B UXA Signal Analyzer Service Guide...
  • Page 418 Figure 19-13 for locations of RF area cables for Options 544 and 550. Figure 19-11 RF Area Cables (Options 544, 550) Figure 19-12 RF Front End Cables (Options 544, 550) (Option B5X shown) N9040B UXA Signal Analyzer Service Guide...
  • Page 419 Replaceable Parts Figure 19-13 RF Front End Side Cables (Options 544, 550) N9040B UXA Signal Analyzer Service Guide...
  • Page 420 Cable, Semi-rigid, SW5 Filter Switch Port C to A13A1 Front End Assembly N9020-20276 Cable, Semi-rigid, A13A1 Front End Assembly J10 to SW4 Filter Switch N9020-20266 Port C Cable, Semi-rigid, A13A1 Front End Assembly J3 to A13A2 Switched IF N9020-20245 Filter J6 N9040B UXA Signal Analyzer Service Guide...
  • Page 421 Cable, Semi-rigid, SW6 MPB Switch Port 4 to A12 YTF Input N9040-20109 Cable, Semi-rigid, A12 YTF Output to SW6 MPB Switch Port 3 N9040-20110 Cable, Semi-rigid, SW6 MPB Switch Port 2 to A13A1 Front End Assembly N9040-20111 N9040B UXA Signal Analyzer Service Guide...
  • Page 422 Figure 19-14 Card Cage Boards Table 19-10 Card Cage Boards Item Description Keysight Part Number A15 Front End Controller N9020-60295 A16 Reference Assembly N9020-60387 A21 Wideband Analog I.F. Assembly N9020-60043 A14 L.O. Synthesizer Assembly N9020-60377 N9040B UXA Signal Analyzer Service Guide...
  • Page 423 N9040-60033 Wire Harness, A15 Front End Controller J801 to MPB Switch(s) N9040-60039 Cable, Coax, A13A1 Front End Assembly J7 to A15 Front End Controller J902 Options 508, 513, 526 8121-2608 Options 544, 550 8121-2027 N9040B UXA Signal Analyzer Service Guide...
  • Page 424 Cable, Coax, A15 Front End Controller J901 to A21 Wideband 8121-1401 Analog IF J17 Cable, Coax, A16 Reference J726 to A21 Wideband Analog IF 8121-0152 Cable, Ribbon, A15 Front End Controller J802 to SW3 LNP N9040-60038 Switch Control N9040B UXA Signal Analyzer Service Guide...
  • Page 425 Options 508, 513, 526 N9040-20038 Options 544, 550 N9040-20112 Cable, Ribbon, A14 DDS LO Synthesizer J8 to A20 YTO N9040-60035 Control Cable, Semi-rigid, FL1 7.2 GHz Bandpass Filter Output N9020-20226 to A14 DDS LO Synthesizer J35002 N9040B UXA Signal Analyzer Service Guide...
  • Page 426 N9020-60016 Screw, M3 X 0.5 (8 mm long) 0515-0372 Cable, Ribbon, A2 25 MHz Analog IF J820 to A3 40 MHz N9020-60046 Digital IF J20 A3W1 Cable Assembly, Smart Noise Source (Wire Harness) N9020-60090 N9040B UXA Signal Analyzer Service Guide...
  • Page 427 Replaceable Parts Figure 19-18 AIF Cables Figure 19-19 DIF Cables N9040B UXA Signal Analyzer Service Guide...
  • Page 428 Cable, Coax, A21 Wideband Analog IF J18 to A3 40 MHz 8121-1401 Digital IF J15 Cable, Coax, A2 25 MHz Analog IF J601 to A3 40 MHz 8121-2607 Digital IF J19 Cable, Coax, A3 40 MHz Digital IF J17 to A16 Reference 8121-1401 J726 N9040B UXA Signal Analyzer Service Guide...
  • Page 429 W1312-60561 A4BT1 CPU Battery 1420-0356 (CR2032) A4A1 Disk Drive Interconnect Board Options PC6, PC6S W1312-63377 Option PC8 W1312-63377 Option PCA W1312-63571 Screw M3 x 0.5 (8 mm long) 0515-0372 A4A2 SD Memory Card 1819-1354 N9040B UXA Signal Analyzer Service Guide...
  • Page 430 A5MP2 Disk Drive Rear Panel W1312-00103 A5MP3 Disk Drive Assembly Handle 1440-0421 Screw M3 x 0.5 (8 mm long) 0515-1035 Screw M2.5 x 0.45 (5 mm long) 0515-2219 Screw M3 x 0.5 (6 mm long) 0515-1227 N9040B UXA Signal Analyzer Service Guide...
  • Page 431 A3 Narrowband Digital I.F. Assembly N9020-60016 A4 CPU Assembly Options PC6, PC6S W1312-60214 Option PC8 W1312-60524 Option PCA W1312-60561 A6 Power Supply 0950-5748 A22 & A23 Wideband Digital I.F. Assemblies N9020-60311 (Options B2X and B5X) N9040B UXA Signal Analyzer Service Guide...
  • Page 432 Replaceable Parts Figure 19-23 Wideband I.F. Ribbon Cables Figure 19-24 Wideband I.F. Cables N9040B UXA Signal Analyzer Service Guide...
  • Page 433 Cable, Ribbon, Ribbon, A21 Wideband Analog IF J23 to N9040-60042 Interconnect Bracket Cable, Ribbon, Ribbon, Interconnect Bracket to A22 N9040-60045 Wideband Digital IF J778 Cable, Ribbon, Interconnect Bracket to A22 Wideband N9040-60041 Digital IF & A23 Wideband Digital IF J778 N9040B UXA Signal Analyzer Service Guide...
  • Page 434 Bracket, Wideband Extension Board (Option RTS) Cable, Flex Circuit, A22 Wideband DIF J9000 to A28 N9040-60047 Wideband DIF Extension Board J1 Cable, Flex Circuit, A23 Wideband DIF J9000 to A28 N9040-60048 Wideband DIF Extension Board J2 N9040B UXA Signal Analyzer Service Guide...
  • Page 435 Replaceable Parts Figure 19-26 H1G Assembly Table 19-20 H1G Assembly Item Description Keysight Part Number A27 H1G Assembly (Option H1G) N9040-60102 N9040B UXA Signal Analyzer Service Guide...
  • Page 436 Replaceable Parts Figure 19-27 Motherboards Table 19-21 Motherboards Item Description Keysight Part Number Rear Motherboard Midplane Board (Rear Motherboard) N9040-63003 Assembly Front Motherboard Motherboard (Front/Horizontal mount) N9040-63002 Bottom Motherboard Interconnect Board N9040-63004 N9040B UXA Signal Analyzer Service Guide...
  • Page 437 Replaceable Parts Figure 19-28 Chassis N9040B UXA Signal Analyzer Service Guide...
  • Page 438 ≥ 5605 and all Options 544 and 550 N9040-00053 Bracket, Motherboard (Front/Horizontal) s/n prefix < 5605 Options 508, 513, 526 N9040-00024 s/n prefix ≥ 5605 and all Options 544 and 550 N9040-00051 N9040B UXA Signal Analyzer Service Guide...
  • Page 439 < 5605 Options 508, 513, 526 N9040-00014 s/n prefix ≥ 5605 and < 5616, Options 508, 5113, 526 N9040-00050 prefix < 5616 Options 544 and 550 s/n prefix ≥ 5616 all frequency ranges N9040-00057 N9040B UXA Signal Analyzer Service Guide...
  • Page 440 Fan Grill (qty 2) 3160-4253 Bracket, Fan (Left side/outer) s/n prefix < 5605 Options 508, 513, 526 N9040-00006 s/n prefix ≥ 5605 and all Options 544 and 550 N9040-00053 Bracket, Fan (right side inner) N9040-00007 N9040B UXA Signal Analyzer Service Guide...
  • Page 441 3.5 mm (Option C35) N9020-60196 Screw 0515-0372 Cable, Semi-rigid, RF Input Connector to A9 Attenuator A Input Option CNF, Type-N Input N9040-20025 Option 544, 550, 2.4 mm Input N9040-20114 Option C35, 3.5 mm Input N9040-20043 N9040B UXA Signal Analyzer Service Guide...
  • Page 442 Cable Assembly, A1A5 Controller Board J16 to Backlight DC to DC N9040-60029 Converter Input, Serial Prefix < MY/SG/US6442 Cable Assembly, A1A5 Controller Board J16 to A1A3 Touch Screen N9040-60029 Display, Serial Prefix ≥ MY/SG/US6442 A1A4 Converter DC-DC 0950-5670 N9040B UXA Signal Analyzer Service Guide...
  • Page 443 Replaceable Parts Table 19-25 Front Frame Parts Item Description Part Number W1 Cable N9040-60030 W29 Semi-Rigid Cable N9040-20044 N9040B UXA Signal Analyzer Service Guide...
  • Page 444 Replaceable Parts Figure 19-32 Front Frame Exploded View N9040B UXA Signal Analyzer Service Guide...
  • Page 445 A1MP25 Front Panel Interface Board Shield N9040-00032 W1 Ribbon Cable N9040-60030 W29 Semi-Rigid Cable N9040-20044 A1A3 Touch Screen Display Serial Prefix < MY/SG/US6442 (Upgrade Kit) N9040-60130 Serial Prefix ≥ MY/SG/US6442 2090-1166 A1A6 Front Panel On Button Keyboard N9040-63016 N9040B UXA Signal Analyzer Service Guide...
  • Page 446 Replaceable Parts Table 19-26 Front Frame Parts Item Description Keysight Part Number A1MP2 Front Panel On Button Keypad light color N9040-40004 dark color N9040-40010 N9040B UXA Signal Analyzer Service Guide...
  • Page 447 Replaceable Parts N9040B UXA Signal Analyzer Service Guide...
  • Page 448: 20 Assembly Replacement Procedures

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 20 Assembly Replacement Procedures What You Will Find in This Chapter Procedures in this chapter enable you to locate, remove, and replace the following major assemblies in your instrument. Refer to Chapter 19, “Replaceable Parts.”...
  • Page 449 Front Panel Shield on page 589 Front Panel Cables on page 590 DC DC Converter Board on page 591 Controller Bracket and Controller Board on page 592 Display Assembly on page 594 Keyboard/Keypad on page 596 N9040B UXA Signal Analyzer Service Guide...
  • Page 450: Before Starting

    Failure to heed the safety precautions can result in severe or fatal injury. N9040B UXA Signal Analyzer Service Guide...
  • Page 451: Tools You Will Need

    Adjustments Tests after an instrument repair Refer to Table 21-1 on page 601 for information about post-repair procedures. If one or more instrument assemblies have been repaired or replaced, perform the related adjustments and performance verification tests. N9040B UXA Signal Analyzer Service Guide...
  • Page 452: Major Assembly Locations

    A22 Wideband Digital IF (Option B2X) & A23 Wideband Digital IF Assemblies (Option B5X) A14 L.O. Synthesizer Assembly A21 Wideband Analog I.F. Assembly (Options B2X and B5X) A16 Reference Assembly A15 Front End Controller A27 H1G Assembly (Option H1G) N9040B UXA Signal Analyzer Service Guide...
  • Page 453: Instrument Outer Case

    4. Using the T-20 driver, remove the four screws (including washers) (3) that hold the rear feet (4) in place. 5. Pull the instrument cover (5) off towards the rear of the instrument. Figure 20-3 Instrument Outer Case Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 454: Replacement

    4. Replace the bottom feet by sliding into place until they snap in. Install the locks by pressing in flat. 5. Replace the handle straps on both sides of the instrument. Torque the handle strap screws to 21 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 455: Top Brace And Card Cage Brace

    (3) (0515-0372), the two screws (4) (0515-1946), the six screws (5) (0515-1946), and the three screws (6) (0515-1946) (only on Option B2X and B5X) attaching the card cage brace to the chassis and the boards. N9040B UXA Signal Analyzer Service Guide...
  • Page 456 1. To replace the top brace or the card cage bracket, place them into the correct position and attach the screws referred to in the removal process. Torque to 9 inch-pounds. 2. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 457: Serial Number Prefix ≥ 5605 And All Options 544 And 550

    (3) (0515-1946), and the six screws (4) (0515-0372) attaching the card cage brace to the chassis and the boards. The number of 0515-1946 screws will vary depending on the options installed (fifteen with Options B2X and B5X, twelve with Option B40 only). N9040B UXA Signal Analyzer Service Guide...
  • Page 458 1. To replace the top brace or the card cage bracket, place them into the correct position and attach the screws referred to in the removal process. Torque to 9 inch-pounds. 2. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 459: Rf Area - Options 508, 513, 526

    To gain access to any of the RF section parts for removal, follow these steps: 1. Remove the instrument outer case. Refer to the “Instrument Outer Case” removal procedure. 2. Remove the front panel. Refer to the Front Frame Assembly removal procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 460 Remove the RF bracket (1) by removing the eleven (or thirteen with Option RTS) screws (2) (0515-0372), and the two screws (3) (0515-1946), using the T-10 driver. Figure 20-7 RF Bracket Removal, Serial Number Prefix < 5605 Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 461: After The Part Has Been Replaced, Follow These Steps

    (0515-1946), using the T-10 driver. Torque to 9 inch-pounds. 2. Replace the front panel. Refer to the “Front Frame Assembly” replacement procedure. 3. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 462: A9 & A10 Rf Attenuators

    3. Remove the two or three screws (3) (0515-0372), depending on the bracket in your instrument, that attach the attenuator bracket to the chassis using the T-10 driver. 4. Remove the attenuator from the bracket by removing the two screws (4) (0515-0372). N9040B UXA Signal Analyzer Service Guide...
  • Page 463 Assembly Replacement Procedures RF Area - Options 508, 513, 526 Figure 20-9 Attenuators Removal - Serial Number < 5605 Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 464 Assembly Replacement Procedures RF Area - Options 508, 513, 526 Figure 20-10 Attenuators Removal - Serial Number ≥ 5605 (Options 508, 513, 526) Item Keysight Part Number N9040-20025 N9040-20027 N9040-20026 N9040-20028 N9040B UXA Signal Analyzer Service Guide...
  • Page 465 4. Replace the ribbon cable and semi-rigid cables W2, W3, W4, and W51 to the attenuators. Torque the semi-rigid cables to 10 inch-pounds. 5. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 466: A11 Low Band Switch

    3. Remove the four screws (2) (0515-0372) using the T-10 driver. The A11 low band switch (1) can now be removed from the chassis. Figure 20-11 Low Band Switch Cable Removal - Options 508, 513, 526 Item Keysight Part Number N9040-20032 N9040-20031 N9040-20030 N9040B UXA Signal Analyzer Service Guide...
  • Page 467 10 inch-pounds. 3. Replace the ribbon cable W7. Ensure locking tabs on the sides of the connector are engaged. 4. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 468: A12 Ytf Preselector

    20-13. From the bottom of the instrument, remove the four screws (1) (0515-0372). The A12 YTF Preselector can now be removed from the chassis. Figure 20-12 YTF Preselector Removal - Options 508, 513, 526 Item Keysight Part Number N9040-20033 N9040-20034 N9040B UXA Signal Analyzer Service Guide...
  • Page 469 Assembly Replacement Procedures RF Area - Options 508, 513, 526 Figure 20-13 YTF Preselector and YTO Bottom Screws N9040B UXA Signal Analyzer Service Guide...
  • Page 470 Figure 20-12. Replace the cables W10 and W14. Torque to 10 inch-pounds. 5. Replace the wire harness W11. 6. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 471: A20 Yto

    20-12. Replace the cable W20. Torque to 10 inch-pounds. 3. Replace the ribbon cable W23. Ensure the locking latch is engaged. 4. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 472: Low Noise Path And Microwave Preselector Bypass Switches

    Figure 20-15 Front Brace Removal 2. Refer to Figure 20-16. Remove cables W10, W14, W15, W51, W52, and W54. Figure 20-16 W10, W14, W15, W51, W52, and W54 Cables Removal - Options 508, 513, N9040B UXA Signal Analyzer Service Guide...
  • Page 473 Unplug the ribbon cable and the wire harnesses from each switch. The switches and bracket can now be removed from the chassis. Figure 20-17 Switch Bracket Bottom Screws N9040B UXA Signal Analyzer Service Guide...
  • Page 474 5. Refer to Figure 20-19. To remove the SW3 transfer switch (1) remove the four screws (2) (0515-1934) attaching the switch to the bracket. Figure 20-19 Removing Transfer Switch from Bracket - Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 475 20-20. To remove the SW1 and SW2 coax switches (2) remove the two screws (1) (0515-1992) attaching each switch to the bracket. Figure 20-20 Removing Coax Switches from Bracket - Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 476 (E4410-00104) to the main switch bracket (4). Torque to 6 inch-lbs. Install SW2 (top switch) with the two screws (1) (0515-1992) and SW2 bracket (3) (N9040-00019). Torque to 6 inch-lbs. Figure 20-21 Coax Switches Replacement - Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 477 20-23. Replace AT1 attenuator (3). Torque to 10 inch-lbs. Replace cables W13 and W53. Torque to 10 inch-lbs. Figure 20-23 Replace Attenuator and Cables - Options 508, 513, 526 Item Keysight Part Number N9040-20036 N9040-20029 N9040B UXA Signal Analyzer Service Guide...
  • Page 478 4. Place the switches and switch bracket (1) into the chassis as shown in Figure 20-24. Plug the ribbon cable and the wire harnesses into each switch. Figure 20-24 Switch Bracket - Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 479 RF Area - Options 508, 513, 526 5. Replace the three screws (1) (0515-0372) that attach the switch bracket to the chassis as shown in Figure 20-25. Torque to 9 inch-lbs. Figure 20-25 Switch Bracket Bottom Screws N9040B UXA Signal Analyzer Service Guide...
  • Page 480 20-26. Replace cables W10, W14, W15, W51, W52, and W54. Torque to 10 inch-lbs. Figure 20-26 W10, W14, W15, W51, W52, and W54 Cables Replacement - Options 508, 513, 526 Item Keysight Part Number N9040-20033 N9040-20034 N9040-20035 N9040-20028 N9040-20031 N9040-20030 N9040B UXA Signal Analyzer Service Guide...
  • Page 481 20-27. Place the front brace (1) into the chassis and secure with the eleven screws (2) (0515-0372). Torque to 9 inch-lbs. Figure 20-27 Front Brace Replacement 8. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 482: A13 Rf Front End Assembly

    2. Refer to Figure 20-28. Remove the chassis base stiffener (1) by removing the six screws (2) (0515-0372) and the two screws (3) (0515-1946). Figure 20-28 Chassis Base Stiffener Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 483 W18, W21 W30, and W33 from the A13 Front End assembly. Figure 20-29 Front End Assembly Cables Removal - Options 508, 513, 526 Figure 20-30 Front End Assembly Side Cables Removal - Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 484 20-32. From the bottom of the instrument, remove the six screws (2) (0515-0372) that attach the Front End assembly (1) to the chassis. The Front End assembly can now be removed. Figure 20-32 Front End Assembly Bottom Screws - Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 485 9 inch-pounds in the order shown (#1 to #6). Make sure ribbon cable W22 is under the 4 guide tabs on the back of the Front End assembly. Figure 20-33 Front End Assembly Bottom Screws - Replacement N9040B UXA Signal Analyzer Service Guide...
  • Page 486 20-34. Place the chassis base stiffener (1) in position on the chassis base. Secure with the six screws (2) (0515-0372) and the two screws (3) (0515-1946). Torque all screws to 9 inch-pounds. Figure 20-34 Chassis Base Stiffener Replacement N9040B UXA Signal Analyzer Service Guide...
  • Page 487 W18, W21 W30, and W33. Torque to 10 inch-pounds. Figure 20-35 Front End Assembly Cables Replacement - Options 508, 513, 526 Figure 20-36 Front End Assembly Side Cables Replacement - Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 488 “Low Noise Path and Microwave Preselector Bypass Switches” replacement procedure on page 489 replace the bracket and switch assembly and front brace. 6. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 489: Rf Area - Options 544, 550

    To gain access to any of the RF section parts for removal, follow these steps: 1. Remove the instrument outer case. Refer to the “Instrument Outer Case” removal procedure. 2. Remove the front panel. Refer to the “Front Frame Assembly” removal procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 490: After The Part Has Been Replaced, Follow These Steps

    (0515-1946), using the T-10 driver. Torque to 9 inch-pounds. 2. Replace the front panel. Refer to the “Front Frame Assembly” replacement procedure. 3. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 491: A9 & A10 Rf Attenuators

    2. Remove the ribbon cables attached to each attenuator. 3. Remove the three screws (3) (0515-0372) that attach the attenuator bracket to the chassis using the T-10 driver. 4. Remove the attenuator from the bracket by removing the two screws (4) (0515-0372). N9040B UXA Signal Analyzer Service Guide...
  • Page 492 Assembly Replacement Procedures RF Area - Options 544, 550 Figure 20-40 Attenuators Removal - Options 544, 550 Item Keysight Part Number N9040-20114 N9040-20103 N9040-20102 N9040-20104 N9040B UXA Signal Analyzer Service Guide...
  • Page 493 5. Replace the ribbon cable and semi-rigid cables W2, W3, W4, and W51 to the attenuators. Torque the semi-rigid cables to 10 inch-pounds. 6. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 494: A11 Low Band Switch

    3. Remove the five screws (2) (0515-0372) using the T-10 driver. The A11 low band switch (1) can now be removed from the chassis. Figure 20-41 Low Band Switch Cable Removal - Options 544, 550 Item Keysight Part Number N9040-20108 N9040-20106 N9040-20107 N9040B UXA Signal Analyzer Service Guide...
  • Page 495 10 inch-pounds. 3. Replace the ribbon cable W7. Ensure locking tabs on the sides of the connector are engaged. 4. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 496: A12 Ytf Preselector

    20-43. From the bottom of the instrument, remove the four screws (1) (0515-0372). The A12 YTF Preselector can now be removed from the chassis. Figure 20-42 YTF Preselector Removal - Options 544, 550 Item Keysight Part Number N9040-20109 N9040-20110 N9040B UXA Signal Analyzer Service Guide...
  • Page 497 Assembly Replacement Procedures RF Area - Options 544, 550 Figure 20-43 YTF Preselector and YTO Bottom Screws N9040B UXA Signal Analyzer Service Guide...
  • Page 498 Figure 20-42. Replace the cables W67 and W68. Torque to 10 inch-pounds. 5. Replace the wire harness W11. 6. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 499: A20 Yto

    20-42. Replace the cable W20. Torque to 10 inch-pounds. 3. Replace the ribbon cable W23. Ensure the locking latch is engaged. 4. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 500: Transfer Switches

    20-45. Remove the front brace (1) by removing the eleven screws (2) (0515-0372). Figure 20-45 Front Brace Removal 2. Refer to Figure 20-46. Remove cables W51, W52, W54, W66, W67, W68, and W69. Figure 20-46 Transfer Switch Cables Removal - Options 544, 550 N9040B UXA Signal Analyzer Service Guide...
  • Page 501 Unplug the ribbon cable and the wire harnesses from each switch. The switches and bracket can now be removed from the chassis. Figure 20-47 Switch Bracket Bottom Screws N9040B UXA Signal Analyzer Service Guide...
  • Page 502 4. Refer to Figure 20-48. To remove either SW3 or SW6 transfer switch remove the four screws (1) (0515-1934) attaching the switch to the bracket. Figure 20-48 Removing Transfer Switch from Bracket - Options 544, 550 N9040B UXA Signal Analyzer Service Guide...
  • Page 503 2. Place the switches and switch bracket (1) into the chassis as shown in Figure 20-50. Plug the ribbon cable and the wire harnesses into each switch. Figure 20-50 Switch Bracket - Options 544, 550 N9040B UXA Signal Analyzer Service Guide...
  • Page 504 RF Area - Options 544, 550 3. Replace the three screws (1) (0515-0372) that attach the switch bracket to the chassis as shown in Figure 20-51. Torque to 9 inch-lbs. Figure 20-51 Switch Bracket Bottom Screws N9040B UXA Signal Analyzer Service Guide...
  • Page 505 20-52. Replace cables W51, W52, W54, W66, W67, W68, and W69. Torque to 10 inch-lbs. Figure 20-52 Transfer Switch Cables Replacement - Options 544, 550 Item Keysight Part Number N9040-20104 N9040-20106 N9040-20107 N9040-20105 N9040-20109 N9040-20110 N9040-20111 N9040B UXA Signal Analyzer Service Guide...
  • Page 506 20-53. Place the front brace (1) into the chassis and secure with the eleven screws (2) (0515-0372). Torque to 9 inch-lbs. Figure 20-53 Front Brace Replacement 6. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 507: A13 Rf Front End Assembly

    2. Refer to Figure 20-54. Remove the chassis base stiffener (1) by removing the six screws (2) (0515-0372) and the two screws (3) (0515-1946). Figure 20-54 Chassis Base Stiffener Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 508 W17, and W30 from the A13 Front End assembly. Some cables will not be present if the instrument is not Option B5X. Figure 20-55 Front End Assembly Cables Removal - Options 544, 550 (Option B5X shown) N9040B UXA Signal Analyzer Service Guide...
  • Page 509 20-57. From the bottom of the instrument, remove the six screws (2) (0515-0372) that attach the Front End assembly (1) to the chassis. The Front End assembly can now be removed. Figure 20-57 Front End Assembly Bottom Screws - Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 510 9 inch-pounds in the order shown (#1 to #6). Make sure ribbon cable W22 is under the 4 guide tabs on the back of the Front End assembly. Figure 20-58 Front End Assembly Bottom Screws - Replacement N9040B UXA Signal Analyzer Service Guide...
  • Page 511 20-59. Place the chassis base stiffener (1) in position on the chassis base. Secure with the six screws (2) (0515-0372) and the two screws (3) (0515-1946). Torque all screws to 9 inch-pounds. Figure 20-59 Chassis Base Stiffener Replacement N9040B UXA Signal Analyzer Service Guide...
  • Page 512 RF Area - Options 544, 550 3. Refer to Figure 20-60. Replace cables W8, W16, W17, W18, W21, W30, and W33. Torque to 10 inch-pounds. Figure 20-60 Front End Assembly Cables Replacement - Options 544, 550 N9040B UXA Signal Analyzer Service Guide...
  • Page 513 “Transfer Switches” replacement procedure on page 516 to replace the bracket and switch assembly and front brace. 6. Replace the RF bracket, front panel, and instrument outer case as described on page 472. N9040B UXA Signal Analyzer Service Guide...
  • Page 514: Card Cage Boards

    After the part has been replaced, follow these steps: 1. Replace the card cage brace as described in the “Top Brace and Card Cage Brace” replacement procedure. 2. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 515: A15 Front End Control

    2. Refer to Figure 20-63. Reinstall cables W5, W7, W11, W12, W16, W22, W25, W26, W27, W28, W30, and W55. You should hear a distinct "snap" when reinstalling the small mmcx cables. N9040B UXA Signal Analyzer Service Guide...
  • Page 516: A16 Reference Assembly

    20-65. Remove cables W3, W18, W31, W33, W34 (if present), W36, W37, W39, and W46 or W47. Figure 20-64 Reference Cables The cables will look different for an Option B40 instrument. Figure 20-65 Reference Cables - Option B40 N9040B UXA Signal Analyzer Service Guide...
  • Page 517 3. Refer to Figure 20-64. Reinstall cables W3, W18, W31, W33, W34, W36, W37, W39, and W46. You should hear a distinct "snap" when reinstalling the small mmcx cables. Torque the semi-rigid cables to 10 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 518: A16A3 Reference Ocxo

    6. Reinstall the A16 Reference assembly into the instrument. Refer to the A16 Reference Assembly section in this chapter. Table 20-1 A16 Reference Assembly Related Parts Item Keysight Part Number A16 Reference Assembly N9020-60387 A16A3 Reference OCXO N9020-63194 N9040B UXA Signal Analyzer Service Guide...
  • Page 519: A21 Wideband Analog I.f. Assembly (Option B2X And B5X Only)

    (1) (0515-0372). Then unplug W56 from the interconnection with W57. Figure 20-68 Wideband I.F. Ribbon Cable 4. Refer to Figure 20-69. Remove cables W34, W40, W41, W45, and W46. Figure 20-69 Wideband I.F. Cables N9040B UXA Signal Analyzer Service Guide...
  • Page 520 20-68. Plug ribbon cable W56 into W57 at the interconnect. Replace the single screw (1) (0515-0372). Torque to 9 inch-pounds. 5. Replace the top brace as described in the “Top Brace and Card Cage Brace” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 521: A14 L.o. Synthesizer

    20-66. Replace the two screws (4) (0515-1946). Torque to 9 inch-pounds. 3. Refer to Figure 20-70. Reinstall cables W20, W21, W23, and W32. Torque the semi-rigid cables to 10 inch-pounds. 4. Refer to Figure 20-71. Reinstall cable W31. Torque to 10 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 522: Rear Panel

    20-72. Remove the twenty-one screws (1) (0515-0372) and the four screws (2) (0515-1946). The rear panel can now be removed from the chassis. Figure 20-72 Rear Panel Screw Locations Serial Number Prefix < 5616 N9040B UXA Signal Analyzer Service Guide...
  • Page 523 20-73. Remove the fifteen screws (1) (0515-0372), the four screws (2) (0515-1946), and the eight screws (3) (0515-0433). The rear panel can now be removed from the chassis. Figure 20-73 Rear Panel Screw Locations Serial Number Prefix ≥ 5616 N9040B UXA Signal Analyzer Service Guide...
  • Page 524: Replacement

    (2) (0515-1946). Torque to 9 inch-pounds. — Replace the eight screws (3) (0515-0433). Torque to 21 inch-pounds. 4. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 525: A22 & A23 Wideband Digital I.f. Boards

    (2) (0515-0372) and the one or two screws (3) (0515-1946). Option B2X instruments will only have the top screw, while Option B5X instruments will have both. Figure 20-74 Rear Brace Removal Serial Number Prefix < 5605 Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 526 (2) (0515-0372) and the one or two screws (3) (0515-1946). Option B2X instruments will only have the top screw, while Option B5X instruments will have both. Figure 20-75 Rear Brace Removal Serial Number Prefix ≥ 5605 and All Options 544 and 550 N9040B UXA Signal Analyzer Service Guide...
  • Page 527 Unplug the ribbon cables from each Wideband Digital I.F. board. Use the ejectors to remove the boards from the chassis by sliding them towards the rear of the instrument. Figure 20-76 Wideband Digital I.F. Boards Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 528: Replacement

    (3) (0515-1946). Torque all screws to 9 inch-pounds. 5. Replace the top brace as described in the “Top Brace and Card Cage Brace” replacement procedure. 6. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 529: A27 H1G Assembly (Option H1G)

    Avoid damaging the cables still attached. Remove the IF 2 IN and IF 2 OUT cables from the rear panel. 6. Refer to Figure 20-77. Remove the rear brace (1) by removing the four screws (2) (0515-0372) and the seven screws (3) (0515-1946). N9040B UXA Signal Analyzer Service Guide...
  • Page 530 8. Refer to Figure 20-78.Remove the snap-in cables from the board assembly. Leave the blue cables attached for removal later. Figure 20-78 Early H1G Assembly N9040B UXA Signal Analyzer Service Guide...
  • Page 531 Replace the cable ties after cable re-routing. N9040B UXA Signal Analyzer Service Guide...
  • Page 532 10.Re install the rear brace and rear panel using the screws removed earlier. 11.Locate the black plastic hole plug in the kit and install in the IF 2 IN hole on the rear panel. 12.Re install the top brace and instrument enclosure. N9040B UXA Signal Analyzer Service Guide...
  • Page 533: Replacement Process When The H1G Assembly Is The Later Version

    6. Remove the snap-in cables from the board assembly. Remove the blue cable from the H1G assembly J12 using a 5/16-inch wrench. See Figure 20-81. N9040B UXA Signal Analyzer Service Guide...
  • Page 534 4. Connect the 13, 15 and 16 color cables to the H1G assembly J13, J15 and J16. Assure the cables snap in securely. 5. Re install the rear brace and rear panel using the screws removed earlier. 6. Re install the top brace and instrument enclosure. N9040B UXA Signal Analyzer Service Guide...
  • Page 535: A28 Wideband Extension Board (Option Rts)

    Figure 20-82. Remove the RF bracket (1) by removing the thirteen screws (2) (0515-0372), and the two screws (3) (0515-1946), using the T-10 driver. Figure 20-82 RF Bracket Removal, Serial Number Prefix < 5605 N9040B UXA Signal Analyzer Service Guide...
  • Page 536 Figure 20-83. Remove the RF bracket (1) by removing the thirteen screws (2) (0515-0372), and the six screws (3) (0515-1946), using the T-10 driver. Figure 20-83 RF Bracket Removal, Serial Number ≥ Prefix 5605 N9040B UXA Signal Analyzer Service Guide...
  • Page 537 Remove the three screws (1) attaching the Wideband Extension board (2) to the chassis. The A28 Wideband Extension board can now be removed from the chassis. Figure 20-84 Wideband Extension Board Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 538 LED to be visible from the rear panel. The gasket is fragile. Carefully peel off the backing from the gasket and apply the sticky side of the gasket over the two Wideband Extension board connectors. N9040B UXA Signal Analyzer Service Guide...
  • Page 539: Replacement

    A28 Wideband Extension Board (Option RTS) Replacement 1. Refer to Figure 20-86 Figure 20-87. The flex circuit cables will need to be routed as shown. Figure 20-86 Flex Circuit Routing - 1 Figure 20-87 Flex Circuit Routing - 2 N9040B UXA Signal Analyzer Service Guide...
  • Page 540 546 page 547. 5. Replace the top brace. Refer to the “Top Brace and Card Cage Brace” replacement procedure. 6. Replace the instrument outer case. Refer to the “Instrument Outer Case” replace procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 541: A6 Power Supply

    A6 power supply (1) to the chassis. The power supply can now be removed by sliding it out of the rear of the chassis. Figure 20-89 Power Supply Removal Serial Number Prefix < 5605 Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 542 (2) to the A6 power supply (1). When reinstalling the bracket torque the screws to 9 inch-pounds. Figure 20-90 Power Supply Bracket Separation Serial Number Prefix < 5605 Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 543 A6 power supply (1) to the bracket. The power supply can now be removed by sliding it out of the rear of the chassis. Figure 20-91 Power Supply Removal Serial Number Prefix ≥ 5605 and All Options 544 and 550 N9040B UXA Signal Analyzer Service Guide...
  • Page 544: Replacement

    Digital I.F. Boards” replacement procedure. 4. Replace the top brace as described in the “Top Brace and Card Cage Brace” replacement procedure. 5. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 545: A4 Cpu/A5 Solid State Drive

    1. Refer to Figure 20-92. Slide the CPU assembly into the slot and use the ejectors to mate the CPU with the rear motherboard. Replace the six screws (2) (0515-0372). Torque to 9 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 546: Replacement Of A5 Ssd Or A4A1Cpu Memory Card

    Replacement of A5 SSD or A4A1CPU Memory Card Disk Drive Removal 1. Refer to Figure 20-93. Loosen the thumb screw (2) and pull the SSD (1) out of the CPU assembly. Figure 20-93 SSD Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 547 Make sure not to use the 0515-0372 screw because for the PC6 processor it will cause the SSD to interfere with the CPU memory card. 2. Refer to Figure 20-93. Slide the SSD into the CPU assembly and push to mate the connector. Secure the thumb screw to 9 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 548 To install the memory card push it into the slot until you feel the spring catch. Then replace the SSD as described on page 558. Figure 20-95 CPU Memory Card Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 549: A2 Aif/A3 Dif

    2. Remove the rear panel. Refer to the “Rear Panel” removal procedure. 3. Refer to Figure 20-96. Remove cables W39, W40, W42, and W47 from the bottom of the DIF assembly. Figure 20-96 DIF Cables N9040B UXA Signal Analyzer Service Guide...
  • Page 550: Separate Aif/Dif Assembly

    Separate AIF/DIF Assembly 1. Refer to Figure 20-98. To separate the AIF (1) from the DIF (2), unplug ribbon cable W43 from the AIF assembly. 2. From underneath the assembly, remove the three screws (3) (0515-0372). N9040B UXA Signal Analyzer Service Guide...
  • Page 551: Replacement

    20-96. Replace cables W39, W40, W42, and W47 to the bottom of the DIF assembly. 5. Replace the rear panel. Refer to the “Rear Panel” replacement procedure. 6. Replace the instrument outer case. Refer to the “Instrument Outer Case” replace procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 552: Fan Assembly

    20-99. Remove the nine screws (1) (0515-0372) and the two screws (2) (0515-1946) that attach the fan bracket to the chassis. Figure 20-99 Fan Bracket Removal Serial Number Prefix < 5605 Options 508, 513, 526 N9040B UXA Signal Analyzer Service Guide...
  • Page 553 20-100. Remove the seven screws (1) (0515-0372) and the six screws (2) (0515-1946) that attach the fan bracket (3) to the chassis. Figure 20-100 Fan Bracket Removal Serial Number Prefix ≥ 5605 and All Options 544 and 550 N9040B UXA Signal Analyzer Service Guide...
  • Page 554 Assembly Replacement Procedures Fan Assembly 5. Refer to Figure 20-101. Fold the fan bracket down and unplug both fan wires from the rear motherboard. Figure 20-101 Unplug Fan Wires N9040B UXA Signal Analyzer Service Guide...
  • Page 555: Fan Replacement

    Feed the fan wires through the grommet. Reattach the wire retaining clip with the screw (0515-0372). 3. Place the side bracket (4) into position and replace the six screws (2) (0515-1038). Torque to 9 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 556: Replacement

    Torque all screws to 9 inch-pounds. 4. Replace the front frame. Refer to the “Front Frame Assembly” replacement procedure. 5. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 557: Motherboards

    “Top Brace and Card Cage Brace” removal procedure. 3. Remove the front frame. Refer to the “Front Frame Assembly” removal procedure. 4. Remove all of the card cage assemblies. Refer to the “Card Cage Boards” procedures. N9040B UXA Signal Analyzer Service Guide...
  • Page 558 20-104. Remove the RF bracket (1) by removing the eleven (or thirteen with Option RTS) screws (2) (0515-0372), and the two screws (3) (0515-1946), using the T-10 driver. Figure 20-104 RF Bracket Removal, Serial Number Prefix < 5605 N9040B UXA Signal Analyzer Service Guide...
  • Page 559 Serial Number ≥ Prefix 5605 7. Remove the fan bracket. Refer to the “Fan Assembly” removal procedure. 8. Refer to Figure 20-106. Remove the front brace (1) by removing the eleven screws (2) (0515-0372). N9040B UXA Signal Analyzer Service Guide...
  • Page 560 Assembly Replacement Procedures Motherboards Figure 20-106 Front Brace Removal 9. Remove the Low Band switch assembly. Refer to the “A11 Low Band Switch” removal procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 561 20-108. Remove the seven screws (1) (0515-0372) that attach the front motherboard bracket to the chassis. Use the ejectors to disconnect from the rear motherboard and pull out towards the front of the instrument to remove from the chassis. N9040B UXA Signal Analyzer Service Guide...
  • Page 562 14.Refer to Figure 20-109. To separate the front motherboard (1) from the bracket (2), remove the nine screws (3) (0515-0372). When replacing the screws, torque to 9 inch-pounds. Figure 20-109 Front Motherboard and Bracket Separation N9040B UXA Signal Analyzer Service Guide...
  • Page 563 11.Replace the top brace and card cage brace. Refer to the “Top Brace and Card Cage Brace” replacement procedure. 12.Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 564: Rear Motherboard (A7 Rear Motherboard)

    — Refer to Figure 20-110. Remove the six screws (1) (three on each side) (0515-0372) that attach the rear motherboard bracket to the chassis. Figure 20-110 Rear Motherboard Removal Serial Number Prefix < 5616 N9040B UXA Signal Analyzer Service Guide...
  • Page 565 — Refer to Figure 20-111. Remove the eight screws (1) (four on each side) (0515-0433) that attach the rear motherboard bracket to the chassis. Figure 20-111 Rear Motherboard Removal Serial Number Prefix ≥ 5616 N9040B UXA Signal Analyzer Service Guide...
  • Page 566 Torque to 21 inch-pounds. 3. Refer to Figure 20-112. Replace the five screws (1) (0515-0372) to attach the rear motherboard bracket to the bottom of the chassis. Torque to 9 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 567: Bottom Motherboard (A24 Motherboard Interconnect)

    20-113. Remove the two screws (1) (0515-0372) that attach the bottom motherboard to the chassis. Push the bottom motherboard forward to disengage from the locking pins on the chassis. Figure 20-113 Bottom Motherboard Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 568 Torque to 9 inch-pounds. 2. Replace the rear motherboard. Refer to the “Rear Motherboard (A7 Rear Motherboard)” replacement procedure. 3. Replace the front motherboard. Refer to the “Front Motherboard (A8 Front Motherboard)” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 569: Input Connector

    3. Refer to Figure 20-114. Disconnect the W2 semi-rigid cable from the input connector (1). Figure 20-114 Input Connector Removal 4. Remove the two screws (2) (0515-0372) that attach the input connector to the chassis. N9040B UXA Signal Analyzer Service Guide...
  • Page 570: Replacement

    2. Reconnect the semi-rigid cable W2 to the input connector. Torque to 10 inch-pounds. 3. Replace the front frame. Refer to the “Front Frame Assembly” replacement procedure. 4. Replace the instrument outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 571: Front Frame Assembly

    1. Remove the instrument outer case. Refer to the “Instrument Outer Case” removal procedure. 2. Refer to Figure 20-115. Disconnect the two cables (1) (just behind the front frame) with a 5/16-inch wrench and a 1/4-inch wrench. Figure 20-115 EXM Cable N9040B UXA Signal Analyzer Service Guide...
  • Page 572 3. Refer to Figure 20-116. Disconnect W1 ribbon cable from the rear motherboard at the location indicated. The cable has locking tabs on each side, pinch and pull to release. Figure 20-116 Front Panel Cable N9040B UXA Signal Analyzer Service Guide...
  • Page 573 20-117. Using the T-20 driver, remove the fourteen screws (1) (seven on each side) (0515-2044). Using the T-10 driver, remove the one screw (2) (0515-0372). The front frame can now be detached from the chassis. Figure 20-117 Front Frame Assembly Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 574: Replacement

    4. Refer to Figure 20-115. Reconnect the two cables (1) just behind the front frame. Torque to 10 inch-pounds. 5. Replace the outer case. Refer to the “Instrument Outer Case” replacement procedure. N9040B UXA Signal Analyzer Service Guide...
  • Page 575: Front Frame Assembly Components

    Front Frame Parts Item Description Item Description A1A5 Controller Board A1W2 Cable A1W4 Cable A1W3 Cable A1W1 Cable A1A4 Converter DC-DC A1MP14 Front Panel Interface Bracket W1 Cable A1MP21 Display Bracket W29 Semi-rigid Cable N9040B UXA Signal Analyzer Service Guide...
  • Page 576 Assembly Replacement Procedures Front Frame Assembly Figure 20-119 Front Frame Exploded View N9040B UXA Signal Analyzer Service Guide...
  • Page 577 A1W2 Cable Assembly A1W3 Cable Assembly DC-DC Converter Board Front Panel Interface Board Shield W1 Ribbon Cable W29 Semi-Rigid Cable A1A3 Touch Screen Display A1A6 Front Panel On Button Keyboard A1MP2 Front Panel On Button Keypad N9040B UXA Signal Analyzer Service Guide...
  • Page 578 3. When replacing the front panel shield, torque all screws to 9 inch-pounds, When replacing ribbon cable W1 press firmly on each side to ensure the hooks catch on the boards mating connector. 4. When replacing the cable W29 torque to 10 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 579 Assembly Replacement Procedures Front Frame Assembly Front Panel Cables Figure 20-121 Front Panel Cables 1. Refer to Figure 20-121. Remove cables A1W2, A1W3, and A1W4. 2. When replacing the cables, dress in the appropriate cable clamps. N9040B UXA Signal Analyzer Service Guide...
  • Page 580 DC DC Converter Board 1. Refer to Figure 20-122. To remove the DC DC converter board (1), remove the two screws (2) (0515-0372). 2. When replacing the board, torque the screws to 9 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 581 20-124. Unplug cable A1W1 from the controller board at the location shown. Pull up on the locking tab to remove the cable. To remove the controller board (1), remove the four screws (2) (0515-0372). N9040B UXA Signal Analyzer Service Guide...
  • Page 582 3. When replacing the board, position on top of the keyboard and press down to mate connectors. Torque the screws to 9 inch-pounds. When replacing the cable A1W1 press down on the locking tab with the cable fully seated to secure. N9040B UXA Signal Analyzer Service Guide...
  • Page 583 Front Frame Assembly Display Assembly Removal 1. Refer to Figure 20-125. Remove the six screws (2) (0515-1946). The display assembly (1) can now be lifted out of the front frame. Figure 20-125 Display Removal N9040B UXA Signal Analyzer Service Guide...
  • Page 584 4. Place the display compression pad (3) on the display as shown in Figure 20-126. Make sure the pad is seated properly. 5. Place the display bracket (4) onto the display and replace the four screws (5) (0515-1946). Torque to 6 inch-pounds. N9040B UXA Signal Analyzer Service Guide...
  • Page 585 Figure 20-127 Keyboard 2. Refer to Figure 20-128. To separate the keypad (1) from the keyboard (2), pull the keypad away from the keyboard to release the multiple rubber tabs. Figure 20-128 Keyboard Keypad Separation N9040B UXA Signal Analyzer Service Guide...
  • Page 586 4. When replacing the board, position in the front frame and replace the ten screws. Torque the screws to 9 inch-pounds, starting with the screw #1 first and then #2 as shown in Figure 20-127. Replace the RPG knob by firmly pushing it onto the shaft. N9040B UXA Signal Analyzer Service Guide...
  • Page 587 Assembly Replacement Procedures Front Frame Assembly N9040B UXA Signal Analyzer Service Guide...
  • Page 588: Post-Repair Procedures

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide Post-Repair Procedures What You Will Find in This Chapter This chapter provides information that will enable you to return an instrument to full operation following the replacement of any instrument assembly. This information includes a table that shows which adjustments and/or performance tests must be executed after replacing an assembly.
  • Page 589: Post-Repair Procedures

    The following procedures are also included in the “Additional Tasks” on page 605. — “Calibration Data Backup and Restore” — “BIOS Settings Verification” — “FPGA Synchronization” — “Programming Model and Serial Numbers” N9040B UXA Signal Analyzer Service Guide...
  • Page 590 None Residual Responses Power Supply Displayed Average Noise Level Spurious Responses Residual Responses Program Instrument Model and Serial Number Midplane board Displayed Average Noise Level None Run all tests since instrument was Motherboard disassembled. N9040B UXA Signal Analyzer Service Guide...
  • Page 591 Characterize Noise Floor (Press System, Residual Responses or FL2 Alignments, Advanced) Displayed Average Noise Level (Option 510) Spurious Responses Third Order Intermodulation Second Harmonic Distortion Absolute Amplitude Accuracy Frequency Response (below 3.6 GHz) Effective DANL N9040B UXA Signal Analyzer Service Guide...
  • Page 592 IF Frequency Response UWBIF (Option H1G) Also, go to Utilities and perform: IF Frequency Response UWBIF Full Bypass Path IF Frequency Response UWBIF Check (utility) (if Option FBP is present) IF Phase Linearity Utility IF Phase Linearity N9040B UXA Signal Analyzer Service Guide...
  • Page 593 See Chapter 17, “Instrument Software” for instructions on updating the instrument software to the latest version. f. The 50 MHz and 4800 MHz Calibrator Amplitude Adjustments must be done prior to Frequency Response Adjustments. Some Adjustment tests may be found in the Utility portion of the Test Plan. N9040B UXA Signal Analyzer Service Guide...
  • Page 594: Additional Tasks

    2. Connect a USB FLASH drive to one of the front panel USB port. 3. Press System, Alignments, Backup or Restore Align Data. 4. The Alignment Data Wizard window as shown in Figure 21-1 will appear. N9040B UXA Signal Analyzer Service Guide...
  • Page 595 3. Using the mouse double-click on the Windows Explorer link on the desktop and navigate to the following folder: C:\Program Files\Agilent\SignalAnalysis\Physics 4. Double-click on BackupAndRestore.exe and the window shown in Figure 21-2 will appear. N9040B UXA Signal Analyzer Service Guide...
  • Page 596 7. Select “Backup” and wait for the calibration database to be backed up. 8. When the backup has completed close the Calibration Data Backup And Restore window. N9040B UXA Signal Analyzer Service Guide...
  • Page 597 Backup or Restore Align Data... The Alignment Data Wizard window as shown in Figure 21-1 will appear. 4. Follow the on-screen instruction to restore the previously saved calibration data from the USB FLASH drive. 5. Cycle instrument power. N9040B UXA Signal Analyzer Service Guide...
  • Page 598 1. Connect an external USB keyboard to one of the front panel USB ports. 2. Turn on instrument power. 3. Confirm Keysight Technologies splash screen comes up within a few seconds. 4. Press the key on the keyboard specified on the initial boot screen to enter the setup utility.
  • Page 599 Initialization 1. With the new disk drive installed power the instrument on. 2. Within a few seconds you will see the initial Keysight Technologies splash screen, and then the boot selection menu as seen in Figure 21-3.
  • Page 600 If the initialization process would like to be postponed select “Do Not Agree” at this time to safely shut the instrument off. The next time this disk drive is powered on this process will be restarted. N9040B UXA Signal Analyzer Service Guide...
  • Page 601 21-5. At this point the operating system initialization process will be completed and either selection can be made, or the instrument can be powered off. Figure 21-5 Anti-Virus Message 7. The disk drive in use is now ready for further configuration. N9040B UXA Signal Analyzer Service Guide...
  • Page 602 2. Connect a USB mouse to one of the instrument front panel USB ports. 3. Using the mouse double-click on the Windows Explorer link on the desktop and navigate to the following folder: C:\Program Files\Agilent\SignalAnalysis\Physics 4. In this folder find and execute the file named: FPGA_Prog.bat N9040B UXA Signal Analyzer Service Guide...
  • Page 603 7. The programming of the FPGA code could take a few minutes to complete. Once it has finished the instrument will reboot itself to use the new code and this process will then be completed. N9040B UXA Signal Analyzer Service Guide...
  • Page 604 Since the instrument model and serial numbers are stored on the A7 Midplane board assembly, this should only be required when this assembly has been replaced with a new one. N9040B UXA Signal Analyzer Service Guide...
  • Page 605 Post-Repair Procedures N9040B UXA Signal Analyzer Service Guide...
  • Page 606: 22 Functional Tests

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 22 Functional Tests Functional Test Versus Performance Verification Functional tests are tests of various instrument parameters that give a high degree of confidence that the analyzer is operating correctly. They are recommended as a check of analyzer operation for incoming inspection or after a repair.
  • Page 607: Before Performing A Functional Test

    5. Following instrument warm-up, perform the auto align routine: Press System, Alignments, Align Now, All. Functional test accuracy depends on the precision of the test equipment used. Ensure that all of the test equipment is calibrated before running a functional test. N9040B UXA Signal Analyzer Service Guide...
  • Page 608: Test Equipment

    10 dB Fixed Attenuator Frequency: 50 MHz 8493C 8493A (2 required) Option 010 Option 010 VSWR: < 1.2:1 8493B Option 010 Preamp 30 dB Fixed Attenuator Accuracy: < 0.05 dB @ 50 MHz 11708A Options (Pxx) N9040B UXA Signal Analyzer Service Guide...
  • Page 609 Rejection at 75 MHz: > 60 dB Rejection at 80 MHz: > 60 dB Frequency: 10 MHz to 26.5 GHz Power Splitter, 3.5 mm Nominal Insertion Loss: 6 dB 11667B Tracking Between Ports: < 0.25 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 610 PSG model numbers: E8244A, E8254A, E8247C Option 520, E8247C Option H31 or 540, E8257D Option 520, E8257D Option 550, E8257D Option 567, E8267D Option 544. c. Maximum frequency equal to or greater than the maximum frequency of the preamplifier option. N9040B UXA Signal Analyzer Service Guide...
  • Page 611: Displayed Average Noise Level (Danl)

    Span, 10, kHz AMPTD Y Scale, –70, dBm AMPTD Y Scale, Attenuation, MechAtten, 0, dB BW, Res BW, 1, kHz BW, Video BW, 100, Hz Meas Setup, Average/Hold, Number, 20, Enter Trace, Trace Average Single N9040B UXA Signal Analyzer Service Guide...
  • Page 612 11.The value of the normalized displayed average noise should be less than the specification value. 12.Change the analyzer center frequency to the next value listed in Table 22-2. Press: FREQ Channel, Center Freq, [Table 2-1 Value], GHz N9040B UXA Signal Analyzer Service Guide...
  • Page 613 Measured Average Noise Level Normalized Average Noise Test Limits Center Frequency (dBm) Level/(1 Hz BW) (dBm) (dBm) 10 MHz –153 2 GHz –152 6 GHz –148 13 GHz –147 20 GHz –140 26.5 GHz –133 N9040B UXA Signal Analyzer Service Guide...
  • Page 614: Frequency Readout Accuracy

    Frequency: 10 MHz to 1.51 GHz 11500E 1 meter VSWR: < 1.4:1 Cable, BNC, Frequency: 10 MHz 10503A 120 cm Synthesized Sweeper Frequency: 10 MHz to 1.51 GHz Figure 22-2 Frequency Readout Accuracy Test Setup N9040B UXA Signal Analyzer Service Guide...
  • Page 615: Procedure

    1504.56 MHz 1505.44 MHz 54.1 1505 1504.8122 MHz 1505.1878 MHz 7.95 1505 1504.97240 MHz 1505.0276 MHz 0.106 1505 1504.999630 MHz 1505.000370 MHz 1.98 517.59 517.58316 MHz 517.59684 MHz 1.98 832.50 832.49316 MHz 832.50684 MHz N9040B UXA Signal Analyzer Service Guide...
  • Page 616: Second Harmonic Distortion (Shd)

    Cutoff Frequency: 50 MHz 0955-0306 50 MHz Low Pass Rejection at 65 MHz: > 40 dB Rejection at 75 MHz: > 60 dB Synthesized Sweeper Frequency: 50 MHz Spectral Purity: Better than –30 dBc N9040B UXA Signal Analyzer Service Guide...
  • Page 617: Procedure

    7. On the signal analyzer, activate the marker delta function by pressing the Marker and Delta keys. 8. On the signal analyzer, press: FREQ Channel, Center Freq, 80, MHz Meas Setup, Average/Hold Number, 20, Enter Trace/Detector, Trace Average Single N9040B UXA Signal Analyzer Service Guide...
  • Page 618 9. Press Peak Search. Enter the displayed value under the Measured Second Harmonic Distortion (dBc) heading in Table 22-4. Table 22-4 Second Harmonic Distortion Results Applied Frequency Measured Second Harmonic Distortion Mixer Level Specification (MHz) (dBc) (dBm) (dBc) –15 –60 N9040B UXA Signal Analyzer Service Guide...
  • Page 619: Amplitude Accuracy At 50 Mhz

    Power Meter Compatible with power sensor E4418B Power Sensor Amplitude Range: -25 dBm to 10 dBm 8485A Power Splitter 3.5 mm (f) connectors 11667B 6 dB loss Synthesized Sweeper Typical Temperature Stability: 0.01 dBc/°C N9040B UXA Signal Analyzer Service Guide...
  • Page 620: Procedure

    4. Press Mode, Spectrum Analyzer, Mode Preset on the analyzer. 5. Set up the synthesized sweeper by pressing: CW, 50, MHz Power Level, -4, dBm RF (On) 6. Set up the signal analyzer by pressing: Input/Output, More, Freq Ref In, External N9040B UXA Signal Analyzer Service Guide...
  • Page 621 Power Meter Amplitude Test Limit Source (dB) (MHz) Amplitude Amplitude Accuracy (dB) Amplitude Meas_amp Power_meter Error (dBm) (dBm) (dBm) (dB) ±1.13 dB ±1.13 dB ±1.13 dB ±1.13 dB ±1.13 dB ±1.13 dB ±1.13 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 622: Testing Preamp Option (P08, P13, P26)

    Amplitude Accuracy Results (Option P08, P13, P26) Nominal Res BW Span Measured Power Meter Amplitude Test Limit Low- Source (kHz) (kHz) Amplitude Amplitude Accuracy (dB) band Amplitude Meas_amp Power_meter Error Preamp (dBm) (dBm) (dBm) (dB) ±1.30 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 623: Frequency Response (Flatness)

    Tracking between ports: < 0.25 dB Synthesized Sweeper Frequency Range: 50 MHz to 50 GHz a. Maximum frequency of the sweeper must be greater than or equal to maximum specified fre- quency of the UXA. N9040B UXA Signal Analyzer Service Guide...
  • Page 624: Procedure

    24 hours. 4. Press Mode, Spectrum Analyzer, Mode Preset on the signal analyzer, and press Preset on the synthesized sweeper. 5. Set up the synthesized sweeper by pressing: CW, 50, MHz Power level, –4, dBm N9040B UXA Signal Analyzer Service Guide...
  • Page 625 17.Compute the flatness error normalized to 50 MHz: (Meas - Meas @ 50 MHz) Error Error 18.Enter the computed flatness error value into the Flat column of Table Norm 22-7. 19.Compare the value of Flat to the test limit. Norm N9040B UXA Signal Analyzer Service Guide...
  • Page 626 ±2.5 dB 9 GHz ±3.0 dB 11 GHz ±3.0 dB 13 GHz ±3.0 dB 14 GHz ±3.5 dB 17 GHz ±3.5 dB 20 GHz ±3.5 dB 23 GHz ±3.5 dB 26 GHz ±3.5 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 627: Frequency Response (Flatness), Preamp On

    Compatible with power sensor E4418B Attenuator, 30 dB Fixed Frequency: 50 MHz 11708A Accuracy: ±0.05 dB Power Sensor Frequency Range: 50 MHz to 26.5 GHz 8485D (Opt P08, P13, P13) Amplitude Range: –65 dBm to –55 dBm N9040B UXA Signal Analyzer Service Guide...
  • Page 628 Synthesized Sweeper Frequency Range: 50 MHz to 50 GHz a. Maximum frequency of the sweeper must be equal to or greater than the maximum frequency of the preamplifier option. Figure 22-6 Frequency Response Test Setup N9040B UXA Signal Analyzer Service Guide...
  • Page 629: Procedure

    22-7. 13.Enter the power sensor calibration factor into the power meter. 14.For frequencies 3.6 GHz and above, press AMPTD Y Scale, then Presel Center to center the preselector filter for an optimum amplitude measurement. N9040B UXA Signal Analyzer Service Guide...
  • Page 630 ±3.0 dB 9 GHz ±3.5 dB 11 GHz ±3.5 dB 13 GHz ±3.5 dB 14 GHz ±4.0 dB 17 GHz ±4.0 dB 20 GHz ±4.0 dB 23 GHz ±4.0 dB 26 GHz ±4.0 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 631: Scale Fidelity

    Cable, 3.5 mm, Frequency: 10 MHz to 26.5 GHz 11500E 1 meter (2 required) VSWR: < 1.4:1 Cable, BNC Frequency: 10 MHz 10503A 120 cm Synthesized Sweeper Output Level Accuracy: 0 to –15 dBm: ±1.0 dB N9040B UXA Signal Analyzer Service Guide...
  • Page 632: Procedure

    Input/Output, More, Freq Ref In, External FREQ Channel, Center Freq, 50, MHz SPAN X Scale, Span, 1, MHz AMPTD Y Scale, Ref Level, 0, dBm Meas Setup, Average/Hold Number, 10, Enter Trace/Detector, Trace Average Peak Search N9040B UXA Signal Analyzer Service Guide...
  • Page 633 Select the next External attenuator setting. b. Press the Restart key to trigger a 10 sweep average. c. Enter the delta marker value into Table 22-9. d. Check delta marker reading against the test limits. N9040B UXA Signal Analyzer Service Guide...
  • Page 634 Functional Tests Scale Fidelity Table 22-9 Scale Fidelity Results Minimum Marker Delta Value Maximum External Attenuator Setting (dB) (dB) (dB) Reference –11.0 –9.0 –21.0 –19.0 –31.0 –29.0 –41.0 –39.0 –51.0 –49.0 N9040B UXA Signal Analyzer Service Guide...
  • Page 635 Functional Tests Scale Fidelity N9040B UXA Signal Analyzer Service Guide...
  • Page 636: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Software and FPGAs What You Will Find in This Chapter Overview on page 648 Instrument Software on page 649 Overview on page 649 Updating Instrument Application Software on page 650 Software Licensing on page 650...
  • Page 637: Instrument Software And Fpgas

    The following two sections in this chapter will deal with any considerations that might come with an instrument repair. Whenever an instrument assembly is replaced, see Chapter 21 “Post-Repair Procedures” Perform all the tasks recommended for that assembly replacement. N9040B UXA Signal Analyzer Service Guide...
  • Page 638: Instrument Software

    89600 VSA software. While the latest revision of the 89600 VSA software is installed in each instrument as it left the factory, it must be updated, and kept in sync with the rest of the instrument application software independently. N9040B UXA Signal Analyzer Service Guide...
  • Page 639: Updating Instrument Application Software

    To determine what revisions are compatible, and if an update is required, see the software compatibility information on the instrument application software download web page listed above. N9040B UXA Signal Analyzer Service Guide...
  • Page 640: Fpgas

    Even if an instrument appears to work properly when an assembly with FPGA code is replaced, that does not mean that the FPGA code is completely compatible with the software version installed in the instrument. There could be incompatibilities that will only be seen under certain measurement conditions. N9040B UXA Signal Analyzer Service Guide...
  • Page 641: Updating Fpga Code

    Figure 23-2 will appear. Figure 23-2 FPGA Programming Utility 6. To program the FPGAs, enter 1 and press Enter. You will need to confirm this selection by pressing 1 and Enter one more time. N9040B UXA Signal Analyzer Service Guide...
  • Page 642 FPGAs 7. The programming of the FPGAs could take a few minutes to complete. Once it has finished the instrument will reboot itself to use the new code and this process will be completed. N9040B UXA Signal Analyzer Service Guide...
  • Page 643 Instrument Software and FPGAs FPGAs N9040B UXA Signal Analyzer Service Guide...
  • Page 644: What You Will Find In This Chapter

    Keysight Technologies N9040B UXA Signal Analyzer Service Guide 24 Performance Verification and Adjustment Software What You Will Find in This Chapter The following information is presented in this chapter: Overview on page 656 Performance Verification Tests on page 656 Adjustments on page 656...
  • Page 645: Overview

    A complete list of the equipment specified by the N7814A software can be found in the web help for the software. Complete List of Required Test Equipment N9040B UXA Signal Analyzer Service Guide...
  • Page 646 This information is subject to change without notice. © Keysight Technologies 2015-2024 Edition 1, July 2024 N9040-90006 www.keysight.com...

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