Keysight N9923A Service Manual
  1. Manuals
  2. Brands
  3. Keysight Manuals
  4. Measuring Instruments
  5. N9923A
  6. Service manual
Keysight N9923A Service Manual

Keysight N9923A Service Manual

Fieldfox rf vector network analyzer
Hide thumbs Also See for N9923A:
Table of Contents

Advertisement

Quick Links

Download this manual See also: User Manual
Keysight N9923A FieldFox RF Vector
Network Analyzer
(2 MHz - 4 GHz)
(2 MHz - 6 GHz)
Service Guide

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the N9923A and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Keysight N9923A

Summary of Contents for Keysight N9923A

  • Page 1 Keysight N9923A FieldFox RF Vector Network Analyzer (2 MHz - 4 GHz) (2 MHz - 6 GHz) Service Guide...

  • Page 2: Safety Notices

    DOCUMENT OR ANY INFORMATION reproduce, release, perform, CONTAINED HEREIN. SHOULD display, or disclose commercial KEYSIGHT AND THE USER HAVE A SEPARATE WRITTEN AGREEMENT computer software or WITH WARRANTY TERMS commercial computer software COVERING THE MATERIAL IN THIS...
  • Page 3 To receive the latest updates by email, subscribe to Keysight Email Updates at the following URL: http://www.keysight.com/find/MyKeysight Information on preventing instrument damage can be found at: www.keysight.com/find/PreventingInstrumentRepair Is your product software up-to-date? Periodically, Keysight releases software updates to fix known defects and incorporate product enhancements. To search for software updates for your product, go to the Keysight Technical Support website at: http://www.keysight.com/find/techsupport...

  • Page 4: Table Of Contents

    Keysight Support, Services, and Assistance ........
  • Page 5 TME Downloads............3-9 Keysight FieldFox Customer Support Web Pages ......3-9 4.
  • Page 6 Removing and Replacing the Case Group Parts ........7-7 Keysight N9923A Service Guide...
  • Page 7 Battery Maintenance ........... . . 8-8 Keysight N9923A Service Guide...

  • Page 8: Safety And Regulatory Information

    Keysight RF Vector Network Analyzer FieldFox Service Guide Safety and Regulatory Information Information in This Chapter This chapter provides safety information that will help protect you and your network analyzer. It also contains information that is required by various government regulatory agencies.

  • Page 9: Safety Symbols

    Warning denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a warning note until the indicated conditions are fully understood and met. Keysight N9923A Service Guide...

  • Page 10: General Safety Considerations

    To avoid electrical shock, do not perform any servicing unless you are qualified to do so. Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended. Discard used batteries according to local ordinances and/or manufacturer’s instructions. Keysight N9923A Service Guide...
  • Page 11 The detachable power cord is the instrument disconnecting device. It disconnects the mains circuits from the mains supply before other parts of the instrument. The front panel switch is only a standby switch and is not a LINE switch (disconnecting device). Keysight N9923A Service Guide...

  • Page 12: Electrostatic Discharge Protection

    3. Connect the other end of the cable to the test port and remove the short from the cable. Figure 1-1 shows a typical ESD protection setup using a grounded mat and wrist strap. Refer to “ESD Supplies” on page 6-13 for part numbers. Keysight N9923A Service Guide...
  • Page 13 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-1 ESD Protection Setup Keysight N9923A Service Guide...

  • Page 14: Regulatory Information

    Forty years is the expected useful life of the product. This symbol on all primary or secondary packaging indicates compliance to China standard GB 18455-2001.  South Korean Certification (KC) mark; includes the marking's identifier code which follows the format: MSIP-REM-YYY-ZZZZZZZZZZZZZZ or KCC-REM-YYY-ZZZZZZZZZZZZ. Keysight N9923A Service Guide...

  • Page 15: Battery Disposal

    If the either the primary power battery, or the RTC (real time clock) battery (on the A3 front panel interface board) needs to be disposed of, dispose of it in accordance with your country’s requirements. If required, you may return the battery to Keysight Technologies for disposal. Refer to “Contacting Keysight” on page 2-6 for assistance.

  • Page 16: General Product Information

    Analyzer Options A list of the options available for the microwave page 2-3 network analyzers. Keysight Support, Services, and The Internet address (URL) for Keysight assistance. page 2-5 Assistance Service and support options available. Calibration options available. Important information about shipping your analyzer to...

  • Page 17: Maintenance

    Do not attempt to clean internally. Physical Maintenance Clean the analyzer case using a dry or slightly damp cloth only. Electrical Maintenance Refer to “Contacting Keysight” on page 2-6 and to Chapter 3, “Tests and Adjustments.” Keysight N9923A Service Guide...

  • Page 18: Analyzer Options

    General Product Information Analyzer Options Analyzer Options Below is a list of options available for the FieldFox N9923A. Additional options may be added as product features are enhanced. Go to www.keysight.com/find/fieldfox2 for information on currently available upgrade options. The base model for the N9923A includes option 104.

  • Page 19: Vector Voltmeter (Vvm) Option

    — Cable Loss (1-port) — Insertion Loss (2-port) Vector Voltmeter (VVM) Option Option 308, Vector Voltmeter Mode This option allows you to make the following measurements: — 1-port cable trimming (magnitude and phase) — 2-port transmission (magnitude only) Keysight N9923A Service Guide...

  • Page 20: Keysight Support, Services, And Assistance

    “Contacting Keysight” on page 2-6. Calibration Options The calibration options listed below are supported by Keysight Technologies. The calibrations may be performed by Keysight Technologies or a qualified customer may perform the calibrations. See Chapter 3 for details on testing the N9923A.

  • Page 21: Contacting Keysight

    Assistance with test and measurements needs and information on finding a local Keysight office are available on the Web at: http://www.keysight.com/find/assist If you do not have access to the Internet, please contact your Keysight field engineer. In any correspondence or telephone conversation, refer to the Keysight product by its model number and full serial number.
  • Page 22 General Product Information Keysight Support, Services, and Assistance — Enter the document’s part number (located on the title page) in the Search box. — Click Search. Keysight N9923A Service Guide...
  • Page 23 General Product Information Keysight Support, Services, and Assistance Keysight N9923A Service Guide...

  • Page 24: Tests And Adjustments

    — The checks verify the operation of the assemblies in your analyzer. — The adjustments allow you to tune your analyzer for maximum response. The Keysight N7841A software package will be required to test and adjust your analyzer. See the section titled “Performance Tests and Adjustments”...

  • Page 25: Before You Begin

    1-5, for all of the procedures in this chapter. Allow the Analyzer to Warm Up Before testing or adjusting the N9923A analyzer, allow it to warm up as described under “UUT Warmup” in the “Getting Started” section of the N7841A help file.
  • Page 26 Cleaning connectors with alcohol shall only be done with the instrument’s power cord removed, and in a well-ventilated area. Allow all residual alcohol moisture to evaporate, and the fumes to dissipate prior to energizing the instrument. Keysight N9923A Service Guide...

  • Page 27: Service Test Equipment

    — Micro SD flash card—Required to re-load firmware onto the A6 SOM board. A “micro” physical sized Secure Digital (SD) flash memory card is required. This card is not available from Keysight. To identify a supplier, search the Web for “micro sd card”.

  • Page 28: Before Returning An Instrument To A Customer

    Service (7) > Display. — Perform an Operational Check as described in the following section. — Connect and disconnect the external battery charger while the N9923A is operating and confirm that the power cord icon is displayed appropriately at the top of the display.

  • Page 29: Operational Check

    7. If the S22 soft key exists, press it to display S22. a. The trace should be between -1 and +1 dB. If the operational check fails, allow the instrument to warm up for 15 minutes and try again. Keysight N9923A Service Guide...

  • Page 30: Performance Tests And Adjustments

    The performance tests and adjustments listed below support the N9923A analyzer. The Keysight N7841A TME software application supports these tests and adjustments. The Keysight N7841A TME software application executes on a PC under the Keysight N7800A test executive. See “TME Downloads” on page 3-9 applicable web links.

  • Page 31: Adjustments

    (i.e. the Factory Cal). It uses an ECal to perform a one port cal on each port, then completes a two port cal using the thru and loads. Note: The Error Terms adjustment should be performed every twelve months to preserve calibration accuracy of CalReady. Keysight N9923A Service Guide...

  • Page 32: Test Software And Information Available On The Web

    TME Downloads Information and download links for the N7841A application are available at www.keysight.com/find/calibrationsoftware. This web site provides links for downloading software and user instructions. Note that the N7800A software must be installed prior to installing the N7841A and it requires a separate license.
  • Page 33 Tests and Adjustments Test Software and Information Available on the Web 3-10 Keysight N9923A Service Guide...

  • Page 34: Troubleshooting

    Keysight RF Vector Network Analyzer FieldFox Service Guide Troubleshooting Information in This Chapter The information in this chapter helps you: — Identify the portion of the analyzer at fault. — Locate the specific troubleshooting procedure to identify the assembly or peripheral at fault.

  • Page 35: Protect Against Electrostatic Discharge (Esd)

    To reduce the chance of electrostatic discharge, follow all of the recommendations outlined in “Electrostatic Discharge Protection” on page 1-5, for all of the procedures in this chapter. Keysight N9923A Service Guide...

  • Page 36: Assembly Replacement Sequence

    Step 2. Replace the faulty assembly and determine what adjustments are necessary. Refer to Chapter 7, “Repair and Replacement Procedures.” Step 3. Perform the necessary adjustments. Refer to Chapter 3, “Tests and Adjustments.” Step 4. Perform the necessary performance tests. Refer to Chapter 3, “Tests and Adjustments.” Keysight N9923A Service Guide...

  • Page 37: Getting Started With Troubleshooting

    Check the Basics A problem can often be solved by repeating the procedure you were following when the problem occurred. Before calling Keysight Technologies or returning the instrument for service, please perform the following checks: 1. Does the analyzer have power available? It is recommended that the battery is installed and the AC power adapter is also connected.
  • Page 38 Troubleshooting Getting Started with Troubleshooting Figure 4-1 Troubleshooting Organization Flowchart Go to “Power Up Troubleshooting” Go to “Front Panel Group Troubleshooting” Go to “Measurement Group Troubleshooting” Keysight N9923A Service Guide...

  • Page 39: Power Up Troubleshooting

    If the display is dark but the unit may have booted successfully: — Wait for two minutes to make sure the boot process has completed, then press any front panel key. If the boot process has completed successfully, the keypad will flash when the key is pressed. Keysight N9923A Service Guide...

  • Page 40: Front Panel Group Troubleshooting

    — Press: Mode > System(7) > the left-most soft key > the next to the left-most soft key > press the up arrow many times. This should bring the display brightness setting to a viewable level. Keysight N9923A Service Guide...

  • Page 41: Measurement Group Troubleshooting

    — Make sure the unit is warmed up for at least 30 minutes. — Make sure the correct cal kit definition is being used; erase user data to force use of factory cal kit definitions (see Chapter 8 for information on the “Erase User Data Utility”). Keysight N9923A Service Guide...

  • Page 42: Theory Of Operation

    Keysight RF Vector Network Analyzer FieldFox Service Guide Theory of Operation Information in This Chapter This chapter provides a general description of the operating theory of the N9923A analyzer. — Theory of operation is explained to the assembly level only.

  • Page 43: Analyzer System Operation

    Analyzer System Operation Analyzer System Operation The N9923A RF vector network analyzer operates as either a 1-port or 2-port network analyzer (NA). One port measurements are made using PORT 1 and two port measurements are made using both PORT 1 and PORT 2.
  • Page 44 Theory of Operation Analyzer System Operation Figure 5-1 Overall Block Diagram Keysight N9923A Service Guide...

  • Page 45: Front Panel Group

    The actual voltage determines the brightness of the backlight. Two control lines from the A5 system board control on/off and intensity functions. These control lines are driven by the system monitor microcontroller on the A5 system board. Keysight N9923A Service Guide...

  • Page 46: A2 Lcd Assembly

    22 to 27 volts. Refer to “Backlight Power” on page 5-4 for more information. The backlight LED’s are arranged along the top and bottom edges of the display. There are three stacks on each edge. Keysight N9923A Service Guide...

  • Page 47: Measurement Group

    2.000 2.732 99.607 100.000 2.732 3.125 100.000 199.750 3.125 5.875 199.750 399.900 5.875 6.250 399.900 800.000 6.250 12.107 800.000 1600.000 12.107 12.500 1600.000 3200.000 12.500 24.607 3200.000 3399.000 24.607 25.000 3399.000 4149.705 25.000 49.607 4149.705 5099.705 Keysight N9923A Service Guide...
  • Page 48 Theory of Operation Measurement Group 49.607 50.000 5099.705 6000.000 50.000 99.607 a. Except for band 1, start frequency is previous stop frequency +0.001 Hz. Keysight N9923A Service Guide...
  • Page 49 Theory of Operation Measurement Group Figure 5-2 Simplified RF Block Diagram Keysight N9923A Service Guide...
  • Page 50 RF1 temperature sensor on the side of the A4 RF board that is away from the A5 system board. It is located near the edge of the A4 RF board that is farthest from the Port 1 and Port 2 connectors. Keysight N9923A Service Guide...

  • Page 51: A5 System Board

    Smart Batt Bus. Batt Neg is connected to the A5 ground plane. There is an input inrush current control circuit on the Ext DC input that limits inrush current to 4 amps. 5-10 Keysight N9923A Service Guide...
  • Page 52 Some sections of the circuitry on the A4 RF board may be switched to low power modes to conserve power and minimize heat. This is accomplished through load switching. See “Power Management Circuitry” on page 5-8 more information. Keysight N9923A Service Guide 5-11...
  • Page 53 Theory of Operation Measurement Group Figure 5-3 Simplified System Board Block Diagram The System Monitor controls the on/off functions of the analog power supplies. All are on or off together except for power sequencing. 5-12 Keysight N9923A Service Guide...
  • Page 54 A 10 MHz signal at the EXT TRIG/EXT REF input may be used to provide and external time base. The external time base function is controlled via the user interface. Refer to the “External Frequency Reference” section of the N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part Number N9923-90001) for additional information.

  • Page 55: A6 Som Board

    The battery is a rechargeable 10.8 V lithium-ion type. Refer to “Battery Disposal” on page 1-8 for important information about replacing and disposing of this battery. Refer to “Battery Related Information” on page 5-16 for details on the main battery. 5-14 Keysight N9923A Service Guide...

  • Page 56: Grounding And Power

    — Batt + —from main battery, nominal 12 volts. All voltages except Ext DC, Batt +, and the System Monitor power can be turned on/off within the analyzer. Refer to “Power Management Circuitry” on page 5-8 for more information. Keysight N9923A Service Guide 5-15...

  • Page 57: Power Control And Management

    — LO—switched to low power state when data is not being taken by receivers. On the A5 system board, each of the ADC’s may be individually switched to a low power mode when not active. 5-16 Keysight N9923A Service Guide...

  • Page 58: Battery Related Information

    The Smart Battery circuit may shut down the battery when the temperature is out of the acceptable range or when the battery charge is too low. See the “Working with the Lithium-Ion Battery” section of the N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part Number N9923-90001) for additional information on: —...
  • Page 59 As a battery goes through charge/discharge cycles, its capacity will decrease. A typical battery will have more than 70% of its initial capacity after 200 full discharge cycles when operating at 20 to 30 ×C ambient temperature. 5-18 Keysight N9923A Service Guide...

  • Page 60: Operation In Modes

    Theory of Operation Operation in Modes Operation in Modes The N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part Number N9923-90001) describes the various modes of operation and describes the user interface for each mode. The following information describes how the hardware is used in the various modes to make measurements.

  • Page 61: Cat, Na, And Vmm Modes

    All measurement circuitry is switched to the low power state during PM (power meter) mode. This is the mode with the lowest power dissipation. The analyzer has no power output capability in this mode. The analyzer essentially functions as a display for a USB power sensor. 5-20 Keysight N9923A Service Guide...

  • Page 62: Temperature Related Information

    Chapter 8 for instructions on viewing temperature readings. See the N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part Number N9923-90001), “FieldFox High-Temperature Protection” section, for information about operation at high temperature.

  • Page 63: User Calibration In Cat And Na Modes

    User Calibration in CAT and NA Modes There are two types of calibrations for the CAT and NA modes: one port and two port. See the N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part number N9923-90001) “Calibration for CAT and NA Modes” section for specific instructions for performing these calibrations.

  • Page 64: Quickcal

    It is a firmware only function; it does not involve analyzer hardware. User Calibration A user calibration is performed with a mechanical cal kit. The N9923A User’s Guide (Part Number N9923-90001) refers to a user calibration as a “mechanical cal”.

  • Page 65: Firmware Related Information

    The user accessible memory is under UserData. See the “File Management” section of the N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part Number N9923-90001) for instructions on saving, recalling, and managing files in the unprotected memory.

  • Page 66: Erase User Data Utility

    Firmware Upgrades Firmware upgrades are available on the Internet. Refer to instructions in the “Update FieldFox Firmware” section of the N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part Number N9923-90001) for details. Chapter 8 for instructions on viewing the current firmware revision.

  • Page 67: Lan Interface

    Theory of Operation LAN Interface LAN Interface See the “System Configuration” section of the N9923A FieldFox RF Vector Network Analyzer User’s Guide (Part Number N9923-90001) for details on reviewing and configuring LAN settings. The LAN interface supports Auto MDIX. When a LAN cable is connected to the FieldFox, if the other end of the cable supports Auto MDIX, there is no need for a cross-over cable.

  • Page 68: Replaceable Parts

    Replaceable Parts Information in This Chapter This chapter: — identifies the replaceable parts for the N9923A RF vector network analyzer. — includes several tables and illustrations to assist you in identifying the correct part for your analyzer. — contains ordering information for new assemblies and rebuilt-exchange assemblies.

  • Page 69: Ordering Information

    Ordering Information To order a part listed in the replaceable parts lists: — include the part number — indicate the quantity required — Contact Keysight Technologies for instructions on where to send the order. Refer to “Contacting Keysight” on page 2-6.

  • Page 70: Assembly Replacement Procedure

    Refer to Chapter 7, “Repair and Replacement Procedures.” Step 4. Perform the necessary adjustments. Refer to Chapter 3, “Tests and Adjustments.” Step 5. Perform the necessary performance tests. Refer to Chapter 3, “Tests and Adjustments.” Keysight N9923A Service Guide...

  • Page 71: Replaceable Parts Listings

    “Front Panel Group” on page 6-5 — “Measurement Group” on page 6-7 — “Case Group” on page 6-10 Miscellaneous parts and accessories not illustrated in any of these groups are listed under: — “Miscellaneous Parts” on page 6-12 Keysight N9923A Service Guide...
  • Page 72 Gap pad, LCD shield (11) 1420-0536 Battery, Lithium-ion, 3V (For Real Time Clock (RTC) backup.) 1. Each time the N9923A case is opened for any reason, you must order a Repair and Re-assembly Kit. See “Miscellaneous Parts” on page 6-12.
  • Page 73 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Group, Exploded View Keysight N9923A Service Guide...
  • Page 74 Connector cover (tethered cap), for type-N connector (28) N9912-20116 System board top shield 1. Each time the N9923A case is opened for any reason, you must order a Repair and Re-assembly Kit. See “Miscellaneous Parts” on page 6-12 Keysight N9923A Service Guide...
  • Page 75 (35) 0515-0430 Screw, machine w/crest cup washer, pan head, M3.0 x 6 mm (36) 0515-1940 Screw, machine w/patch lock, pan head, M2.5 x 6 mm (37) 0515-2349 Screw, machine, 90-deg flat head, M3.0 x 14 mm Keysight N9923A Service Guide...
  • Page 76 Replaceable Parts Replaceable Parts Listings Figure 6-3 Measurement Group, Exploded View Keysight N9923A Service Guide...
  • Page 77 0515-5153 Screw, machine, w/flat washer, pan head, M3.0 x 35 mm (19) N9912-60007 Battery cable 1. Each time the N9923A case is opened for any reason, you must order a Repair and Re-assembly Kit. See “Miscellaneous Parts” on page 6-12.
  • Page 78 Door, middle (SD) (28) W1312-60050 Door, bottom (LAN) (29) N9912-00003 Hinge spacer (see Figure 6-5). One spacer located between (14) and (6), and another spacer located between (16) and (6). Figure 6-4 Case Group, Exploded View Keysight N9923A Service Guide 6-11...

  • Page 79: Miscellaneous Parts

    Repair and Re-assembly Kit IMPORTANT This kit is required each time the N9923A case is opened for any reason. The kit includes the following items, some or all of which are necessary to re-assemble the internal assemblies and the case, depending upon the depth of the repair.
  • Page 80 Static control table mat and earth ground wire 9300-0797 ESD heel strap 9300-1126 Battery Lithium-ion, 11.1 V, rechargeable (LCD gauge) 1420-0908 a. Refer to “Battery Disposal” on page 1-8 for instructions on disposing of the old battery. Keysight N9923A Service Guide 6-13...
  • Page 81 Replaceable Parts Replaceable Parts Listings 6-14 Keysight N9923A Service Guide...

  • Page 82: Repair And Replacement Procedures

    FieldFox Service Guide Repair and Replacement Procedures Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your N9923A RF vector network analyzer. Chapter Seven at-a-Glance Section Title Summary of Content Start Page Personal Safety Warnings Warnings and cautions pertaining to personal safety.

  • Page 83: Personal Safety Warnings

    Intentional interruption is prohibited. Always use the three-prong AC power cord supplied with this product. Failure to ensure adequate grounding by not using this cord may cause product damage. Keysight N9923A Service Guide...

  • Page 84: Electrostatic Discharge (Esd) Protection

    To reduce the chance of electrostatic discharge, follow all of the recommendations outlined in “Electrostatic Discharge Protection” on page 1-5, for all of the procedures in this chapter. Keysight N9923A Service Guide...

  • Page 85: Assembly Replacement Sequence

    Step 3. Replace the faulty assembly and determine what adjustments are necessary. Refer to “Post-Repair Procedures” in this chapter. Step 4. Perform the necessary adjustments. Refer to Chapter 3, “Tests and Adjustments.” Step 5. Perform the necessary performance tests. Refer to Chapter 3, “Tests and Adjustments.” Keysight N9923A Service Guide...

  • Page 86: Removal And Replacement Procedures

    Backup battery for real time clock (Soldered onto the A3 front panel interface page 7-26 battery board.) Main battery Primary power battery page 7-6 Keypad page 7-24 page 7-22 Front panel interface board page 7-24 RF board page 7-28 System board page 7-28 SOM board page 7-28 Keysight N9923A Service Guide...

  • Page 87: Removing And Replacing The Main Battery

    4. Remove the old battery and install the new battery in the battery compartment. 5. Reinstall the battery compartment door by aligning it in position and then sliding it upwards until an audible click is heard. Figure 7-1 Replacing the Main Battery Keysight N9923A Service Guide...

  • Page 88: Removing And Replacing The Case Group Parts

    Replacing the Kickstand, Hinge Cover, and Hinge 1. Remove, and discard, the four screws (item 1) from the kickstand hinge cover. New screws are provided in the Repair and Re-assembly Kit. Figure 7-2 Replacing the Kickstand and Hinge Cover Keysight N9923A Service Guide...
  • Page 89 New screws are provided in the Repair and Re-assembly Kit. d. Place the kickstand assembly in place on the rear case and reinstall the hinge cover with new screws provided in the Repair and Re-assembly Kit. Keysight N9923A Service Guide...

  • Page 90: Keysight N9923A Service Guide

    3. Remove, and discard, the six screws (item 4) that secure the rear case to the front case. New screws are provided in the Repair and Re-assembly Kit. Keysight N9923A Service Guide...
  • Page 91 7-5, to allow access to the blank side panel and strap handle. 5. Remove the strap handle from the two dowel pins. 6. Remove the blank side panel from the groove in the front case. 7-10 Keysight N9923A Service Guide...
  • Page 92 8. Unplug the battery cable, W10, from the A5 system board at the location indicated. 9. The front and rear cases are now completely separated. 10.Remove the blank side panel by lifting it from the groove in the front case. Keysight N9923A Service Guide 7-11...
  • Page 93 Do not over bend the retention clips as they could break. 7-12 Keysight N9923A Service Guide...
  • Page 94 2. Note the orientation of the strap handle, then lift it off of the dowel pins at each end. 3. Slip the new strap handle over the dowel pins. 4. Reinstall the rear case onto the front case. See Combining the Front and Rear Cases. Keysight N9923A Service Guide 7-13...
  • Page 95 5. Install the three doors in the new I/O side panel: a. Place each door in its respective opening with the hinges aligned with the hinge slots in the side panel. 7-14 Keysight N9923A Service Guide...
  • Page 96 9. Reinstall the rear case onto the front case. See Combining the Front and Rear Cases. Replacing the Front Case (including the A1 Keypad) 1. Separate the front and rear cases. See Separating the Front and Rear Cases. Keysight N9923A Service Guide 7-15...
  • Page 97 8. Refer to “Removing and Replacing the Front Panel Group Assemblies” on page 7-21 to reinstall the front panel group assemblies removed in step 7-16 Keysight N9923A Service Guide...
  • Page 98 “Replacing the I/O Side Panel, Doors, and Gasket” on page 7-14 for instructions. 3. Position the front and rear cases side-by-side as shown. 4. Plug the battery cable, W10, into the A5 system board as indicated. Keysight N9923A Service Guide 7-17...
  • Page 99 5. Position the rear case on top of the front case and to one side as shown. 6. Place the blank side panel in the groove in the front case being careful not to damage the gasket. 7. Position the strap handle over the two dowel pins as shown. 7-18 Keysight N9923A Service Guide...
  • Page 100 11.Install six new screws (item 7) to secure the rear case to the front case. These new screws are provided in the Repair and Re-assembly Kit. 12.Tighten the six screws (item 8) that secure the RF top panel. Keysight N9923A Service Guide 7-19...
  • Page 101 Repair and Replacement Procedures Removing and Replacing the Case Group Parts Figure 7-13 Combining the Front and Rear Cases (3) 13.Reinstall the battery. Refer to “Removing and Replacing the Main Battery” on page 7-6. 7-20 Keysight N9923A Service Guide...

  • Page 102: Removing And Replacing The Front Panel Group Assemblies

    Using a 7/16-inch hex nut wrench, remove the hex nut from the RPG shaft. d. Pull the RPG out the back side of the front case and retrieve the lock washer from the front side. Keysight N9923A Service Guide 7-21...
  • Page 103 Remove the four screws (item 1) that attach the LCD shield and discard them. New screws are provided in the Repair and Re-assembly Kit. b. Lift the LCD shield off of the A2 LCD. 7-22 Keysight N9923A Service Guide...
  • Page 104 Reinstall the LCD shield with four new screws provided in the Repair and Re-assembly Kit. Refer to step d on page 7-23 of this procedure. 4. Perform the steps under “Post-replacement Procedure” on page 7-27. Keysight N9923A Service Guide 7-23...
  • Page 105 3. Disconnect the RPG cable, W12, at the A3 FPIB connector as indicated. 4. Disconnect the A2 LCD to FPIB cable, W113, at the A3 FPIB connector as indicated. 7-24 Keysight N9923A Service Guide...
  • Page 106 A2 LCD to A3 FPIB cable, W13, is routed between, not under, the shield gaskets. 12.Secure the shield with four new screws (item 2) provided in the Repair and Re-assembly Kit. 13.Perform the steps under “Post-replacement Procedure” on page 7-27. Keysight N9923A Service Guide 7-25...
  • Page 107 Replacing the Real Time Clock (RTC) Battery Located on the A3 Front Panel Interface Board (FPIB) The RTC battery is a Lithium-ion battery and must be disposed of properly. Refer to “Battery Disposal” on page 1-8 for important instructions on disposing of this battery. 7-26 Keysight N9923A Service Guide...
  • Page 108 A5 system board, and A6 SOM board) as one unit with the I/O panel attached. Refer to “Removing and Replacing the Measurement Group Assemblies” on page 7-28. 2. Combine the front and rear cases. Refer to “Combining the Front and Rear Cases” on page 7-17. Keysight N9923A Service Guide 7-27...

  • Page 109: Removing And Replacing The Measurement Group Assemblies

    LCD Shield, and LCD Cables” on page 7-22. 6. The measurement group assemblies are now completely separated from the analyzer. 7. To remove the I/O panel, refer to “Replacing the I/O Side Panel, Doors, and Gasket” on page 7-14. 7-28 Keysight N9923A Service Guide...
  • Page 110 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-18 Removing All Measurement Group Assemblies as One Unit Keysight N9923A Service Guide 7-29...
  • Page 111 9. Plug the two connector plugs (tethered caps) back into the type-N RF connectors to protect the connectors. 10.Perform the steps under “Post-replacement Procedure” on page 7-42. Figure 7-19 Replacing the RF Top Panel Assembly 7-30 Keysight N9923A Service Guide...
  • Page 112 RF connector, then tighten the two screws that secure the connector. Remove the two alignment screws. 13.Tighten the cable connector nut(s) on cable W1 or W2. 14.Perform the steps under “Post-replacement Procedure” on page 7-42. Keysight N9923A Service Guide 7-31...
  • Page 113 1. Make sure the cable connectors are positioned as shown and that the cable assembly is routed as shown. Cable W6 is the one with a red mark on each connector. 7-32 Keysight N9923A Service Guide...
  • Page 114 5. To remove the I/O panel, refer to “Replacing the I/O Side Panel, Doors, and Gasket” on page 7-14. 6. Perform the steps under “Post-replacement Procedure” on page 7-42. Keysight N9923A Service Guide 7-33...
  • Page 115 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-21 Replacing the A6 SOM Board and Flexible RF Cables 7-34 Keysight N9923A Service Guide...
  • Page 116 ). Repeat this torque sequence one additional time. 15.Reinstall the A6 SOM board and reinstall or reconnect all coax cables that were removed or disconnected previously. Refer to “Replacing the A6 SOM Board and Flexible RF Cables” on page 7-32. Keysight N9923A Service Guide 7-35...
  • Page 117 16.Remove the system board to FPIB cable from the old A5 system board and install it on the new board. 17.Reinstall the I/O side panel. Refer to “Replacing the I/O Side Panel, Doors, and Gasket” on page 7-14. 18.Perform the steps under “Post-replacement Procedure” on page 7-42. 7-36 Keysight N9923A Service Guide...
  • Page 118 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-22 Replacing the A5 System Board Keysight N9923A Service Guide 7-37...
  • Page 119 7. Re-connect the flexible RF cables to the A4 RF board. Refer to “Replacing the A6 SOM Board and Flexible RF Cables” on page 7-32. 8. Perform the steps under “Post-replacement Procedure” on page 7-42. 7-38 Keysight N9923A Service Guide...
  • Page 120 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-23 Replacing the RF Assembly Including the A4 RF Board Keysight N9923A Service Guide 7-39...
  • Page 121 A5 system board so that it will not interfere with the cases when they are combined. 6. Reconnect the system board to front panel interface board cable at the front panel interface board connector as shown. 7-40 Keysight N9923A Service Guide...
  • Page 122 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-24 Replacing All Measurement Group Assemblies as One Unit Keysight N9923A Service Guide 7-41...
  • Page 123 1. Reinstall the measurement group assemblies into the front case. Refer to “Reinstalling All Measurement Group Assemblies as One Unit” on page 7-40. 2. Combine the front and rear cases. Refer to “Combining the Front and Rear Cases” on page 7-17. 7-42 Keysight N9923A Service Guide...

  • Page 124: Post-Repair Procedures

    * Refer to the following manual checks and procedures for details. Manual Checks and Procedures Manual Check of Keyboard Check that each key works properly. Check that the keyboard backlight LEDs come on when a key is pressed. Keysight N9923A Service Guide 7-43...
  • Page 125 Activate a marker and use the RPG to move the marker. Load Instrument Serial Number into the A5 System Board Instructions for this process may be accessed via the “Load instrument serial number into System Board” link at keysight.com/find/fieldfox2. (Follow the repair / calibration link.) Install Firmware from SD Card A specially configured SD card must be used when the flash memory on the A6 SOM board is new or when the A6 SOM board memory has become corrupted.

  • Page 126: General Purpose Maintenance And Service Procedures

    Keysight RF Vector Network Analyzer FieldFox Service Guide General Purpose Maintenance and Service Procedures Information in This Chapter Chapter Eight at-a-Glance Section Title Summary of Content Start Page Supplemental Information Web site for additional service information that becomes page 8-2 available after printing of this manual.

  • Page 127: Supplemental Information

    General Purpose Maintenance and Service Procedures Supplemental Information Supplemental Information Supplemental information for this service guide is available at: http://na.support.keysight.com/fieldfox/serv_guide_supplement.html This web site contains additional service information and is updated as new information becomes available. Keysight N9923A Service Guide...

  • Page 128: Service Related User Operations

    — Press System(7). — Press Service Diagnostics. — Press Error Log. See the “Firmware Related Information” section of Chapter 5 for details on the error log. To View Temperature Readings — Press System(7). — Press Service Diagnostics. Keysight N9923A Service Guide...

  • Page 129: Erase User Data Utility

    — Press Erase User Data. — Press Confirm Erase. The User Data memory portion is erased, then the instrument restarts. See the “Firmware Related Information” section of Chapter 5 for details on the Erase User Data utility. Keysight N9923A Service Guide...

  • Page 130: Options

    — A list of options from the serial number label on the back of the instrument. — A brief description of why options need to be re-installed. This information will help Keysight identify recurring problems that may need special attention. 2. Within two working days, you will receive an email response with a license file attached.
  • Page 131 General Purpose Maintenance and Service Procedures Options 3. Copy the license file to the root of a USB flash drive. Follow the appropriate instructions in the N9923A Upgrade Installation Instructions. Keysight N9923A Service Guide...

  • Page 132: Firmware Upgrades

    Follow the process under “Install Firmware from SD Card” near the end of Chapter See the “Firmware Related Information” section of Chapter 5 for details on what happens during the firmware update process. Keysight N9923A Service Guide...

  • Page 133: Miscellaneous Service And Maintenance

    Battery Maintenance See the “Working with the Lithium-Ion Battery” section of the N9923A FieldFox RF Vector Network Analyzer User’s Guide for information on the removable battery. In particular, see “Built-In Battery Gauge” and “Reconditioning the Battery”.
  • Page 134 5-23 cautions about error log CE mark 5-23 list of procedures check protection operational sequence , 1-5, 3-2, 4-2, , 6-3, supplies checklist warnings about part numbers before return to customer 6-13 checks and procedures Keysight N9923A Service Guide...
  • Page 135 7-43 ANSI Z540 standards procedures ISM1-A mark 7-43 compliant calibration measurement group ISO 17025 standards Option UK6 operation compliant calibration, commercial calibration troubleshooting Option 1A7 options measurement group analyzer assemblies re-installing options Keysight N9923A Service Guide...
  • Page 136 7-43 measurement group warnings about against ESD , 1-5, 3-2, 4-2, assemblies 7-28 related user operations RF assembly 7-28 static safety parts RF connectors 7-28 part numbers 6-13 Keysight N9923A Service Guide...
  • Page 137 6-13 support contacting Keysight options system board operation temperature battery pack 5-20 related information 5-20 screen 5-20 test equipment service tools service, part numbers 6-12 troubleshooting front panel group measurement group power up where to begin Keysight N9923A Service Guide...
  • Page 138 This information is subject to change without notice. © Keysight Technologies 2010 - 2015 September, 2015 *N9923-90018* N9923-90018 www.keysight.com...

Table of Contents