Keysight N9912A Service Manual
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Keysight N9912A Service Manual

Rf analyzer
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Keysight N9912A
RF Analyzer
(2 MHz – 4 GHz)
(2 MHz – 6 GHz)
Service Guide

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  • Page 1 Keysight N9912A RF Analyzer (2 MHz – 4 GHz) (2 MHz – 6 GHz) Service Guide...
  • Page 3 Service Guide N9912A Keysight Technologies RF Analyzer (2 MHz – 4 GHz) (2 MHz – 6 GHz) Part Number N9912-90003 Printed in USA July 1, 2014 Supersedes Print Date: March 23, 2011  Keysight T echnologies. 2008, 2009, 2011, 2014...
  • Page 4 Certification Keysight Technologies certifies that this product met its published specifications at the time of shipment from the factory. Keysight Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the Institute's calibration facility, and to the calibration facilities of other International Standards Organization members.
  • Page 5 Assistance Product maintenance agreements and other customer assistance agreements are available for Keysight Technologies products. For information about these agreements and for other assistance, contact Keysight. Refer to “Contacting Keysight” on page 2-5. Safety and Regulatory Information The safety and regulatory information pertaining to this product is located in Chapter 1, “Safety and...
  • Page 6 Printing Copies of Documentation from the Web To print copies of documentation from the Web, download the PDF file from the Keysight web site: • Go to www.keysight.com. • Enter the document’s part number (located on the title page) in the Search box.

  • Page 7: Table Of Contents

    Performance Tests (Keysight N7841A Software Package) ........
  • Page 8 Contents Spectrum Analyzer Specific Adjustments ............3-8 4 Troubleshooting Information in This Chapter .
  • Page 9 Contents LAN Interface ................. . 5-29 6 Replaceable Parts Information in This Chapter .
  • Page 10 Contents Service Guide N9912-90003...

  • Page 11: Safety And Regulatory Information

    Safety and Regulatory Information Service Guide N9912-90003...

  • Page 12: Information In This Chapter

    Safety and Regulatory Information RF Analyzer Information in This Chapter N9912A 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 13: Safety Symbols

    RF Analyzer Safety and Regulatory Information N9912A Safety Symbols Safety Symbols The following safety symbols are used throughout this manual. Familiarize yourself with each of the symbols and its meaning before operating this instrument. CAUTION Caution denotes a hazard. It calls attention to a procedure that, if not correctly performed or adhered to, could result in damage to or destruction of the instrument.

  • Page 14: Before Applying Power

    Safety and Regulatory Information RF Analyzer General Safety Considerations N9912A Before Applying Power WARNING If this product is not used as specified, the protection provided by the equipment could be impaired. This product must be used in a normal condition (in which all means for protection are intact) only.

  • Page 15: Electrostatic Discharge Protection

    RF Analyzer Safety and Regulatory Information N9912A Electrostatic Discharge Protection Electrostatic Discharge Protection Protection against electrostatic discharge (ESD) is essential while removing assemblies from or connecting cables to the network analyzer. Static electricity can build up on your body and can easily damage sensitive internal circuit elements when discharged.

  • Page 16: Regulatory Information

    Safety and Regulatory Information RF Analyzer Regulatory Information N9912A Regulatory Information This section contains information that is required by various government regulatory agencies. Instrument Markings The instruction documentation symbol. The product is marked with this symbol when it is necessary for the user to refer to the instructions in the documentation.

  • Page 17: 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 2-5 assistance.
  • Page 18 Safety and Regulatory Information RF Analyzer Regulatory Information N9912A Service Guide N9912-90003...

  • Page 19: General Product Information

    General Product Information Service Guide N9912-90003...

  • Page 20: Information In This Chapter

    Information about electrical maintenance of your analyzer. A list of the options available for the microwave Analyzer Options Page 2-3 network analyzers. The Internet address (URL) for Keysight assistance. Service and support options available. Keysight Support, Services, and Page 2-4 Calibration options available. Assistance Important information about shipping your analyzer to Keysight for service or repair.

  • Page 21: Maintenance

    Chapter 3, “Tests and Adjustments.” Analyzer Options Below is a list of options available for the FieldFox N9912A at the time of initial product release. Additional options will be added as product features are enhanced. Go to www.keysight.com/find/fieldfox2 information on currently available upgrade options.

  • Page 22: Option 302, External Usb Power Sensor Support

    This option allows the use of an external USB controllable power sensor. Option 303, Network Analyzer Capability This option allows the N9912A to make one-port network analyzer measurements. For two-port network analyzer measurements, add Option 110. Keysight Support, Services, and Assistance Information on the following topics is included in this section.

  • Page 23: Contacting Keysight

    Shipping Your Analyzer to Keysight for Service or Repair IMPORTANT Keysight Technologies reserves the right to reformat or replace the internal hard disk drive in your analyzer as part of its repair. This will erase all user information stored on the hard disk.
  • Page 24 General Product Information RF Analyzer Keysight Support, Services, and Assistance N9912A Service Guide N9912-90003...

  • Page 25: Tests And Adjustments

    Tests and Adjustments Service Guide N9912-90003...

  • Page 26: Information In This Chapter

    N9912A Information in This Chapter This chapter contains procedures to help you check, verify, and adjust your N9912A analyzer. • The checks verify the operation of the assemblies in your analyzer. • The adjustments allow you to tune your analyzer for maximum response.

  • Page 27: Before You Begin

    1-5, for all of the procedures in this chapter. Allow the Analyzer to Warm Up Before testing or adjusting the N9912A analyzer, allow it to warm up as described under “DUT Warmup” in the “Getting Started” section of the N7841A help file.

  • Page 28: Review The Principles Of Connector Care

    Prior to making connections to your analyzer, carefully review the information about inspecting, cleaning, and gaging connectors. Refer to the calibration kit documentation for detailed connector care information. For course numbers about additional connector care instruction, contact Keysight Technologies. Refer to “Contacting Keysight” on page 2-5.

  • Page 29: Service Test Equipment

    (SD) flash memory card is between “standard” and “micro” sizes. The memory size must be at least 64 MB and not greater than 2 GB. This card is not available from Keysight. To identify a supplier, search the Web for “mini sd card”.

  • Page 30: Before Returning An Instrument To A Customer

    • Perform an Operational Check as described in the following section. • Connect and disconnect the external battery charger while the N9912A is operating and confirm that the power cord icon is displayed appropriately at the top of the display.

  • Page 31: Performance Tests (Keysight N7841A Software Package)

    Performance Tests (Keysight N7841A Software Package) The performance tests section of the Keysight N7841A software package verifies the electrical performance of your N9912A analyzer. The software automatically configures your analyzer to execute the performance tests. The N7841A software package is not included with the analyzer; it must be ordered separately. It can be downloaded from the Internet and a license purchased on-line, or it can be ordered on a CD-ROM.

  • Page 32: Adjustments (Keysight N7841A Software Package)

    N9912A Adjustments (Keysight N7841A Software Package) The adjustments section of the Keysight N7841A software package may be used to fine-tune your analyzer. The N7841A software package is not included with the analyzer; it must be ordered separately. It can be downloaded from the Internet and a license purchased on-line, or it can be ordered on a CD-ROM.

  • Page 33: Troubleshooting

    Troubleshooting Service Guide N9912-90003...

  • Page 34: Information In This Chapter

    Troubleshooting RF Analyzer Information in This Chapter N9912A 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)

    RF Analyzer Troubleshooting N9912A Protect Against Electrostatic Discharge (ESD) Protect Against Electrostatic Discharge (ESD) This is important. If not properly protected against, electrostatic discharge can seriously damage your analyzer, resulting in costly repair. CAUTION To reduce the chance of electrostatic discharge, follow all of the recommendations outlined “Electrostatic Discharge Protection”...

  • Page 36: 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 37: Troubleshooting Organization

    RF Analyzer Troubleshooting N9912A Getting Started with Troubleshooting Troubleshooting Organization Follow the flowgraph in Figure 4-1 to help direct you to the correct section for troubleshooting the analyzer. Figure 4-1 Troubleshooting Organization Flowchart Go to “Power Up Troubleshooting” on page 4-6 Go to “Front Panel Group...

  • Page 38: Power Up Troubleshooting

    Troubleshooting RF Analyzer Power Up Troubleshooting N9912A Power Up Troubleshooting If the display is operational but the unit does not boot up successfully into CAT mode: • Make sure there is sufficient power for the unit to operate. • Try re-installing firmware using the firmware upgrade process described in Chapter •...

  • Page 39: Front Panel Group Troubleshooting

    RF Analyzer Troubleshooting N9912A Front Panel Group Troubleshooting Front Panel Group Troubleshooting If no sound: • Enter a value of just “.” (decimal point) for a frequency. A double beep should occur. Plug headphones into the unit if there is no sound from the internal speaker.

  • Page 40: Measurement Group Troubleshooting

    • Use only 100 Base T LAN connections. Sometimes there are problems with the slower speed 10 Base T connections. If “ADC Overload” error messages are displayed during S21 or insertion loss measurements: • Perform the “ADC Overload Adjustment” under “Adjustments (Keysight N7841A Software Package)” Chapter Service Guide N9912-90003...

  • Page 41: Theory Of Operation

    Theory of Operation Service Guide N9912-90003...

  • Page 42: Information In This Chapter

    Information in This Chapter N9912A Information in This Chapter This chapter provides a general description of the operating theory of the N9912A analyzer. • Theory of operation is explained to the assembly level only. • Component-level circuit theory is not provided.

  • Page 43: Analyzer System Operation

    Analyzer System Operation Analyzer System Operation The N9912A RF analyzer operates as both a network analyzer (NA) and a spectrum analyzer (SA). The NA functions support the CAT mode. • The NA function supports one port measurements using the RF OUT port and two port measurements using both the RF IN and RF OUT ports.
  • Page 44 Theory of Operation RF Analyzer Analyzer System Operation N9912A Figure 5-1 Overall Block Diagram Service Guide N9912-90003...

  • Page 45: Front Panel Group

    RF Analyzer Theory of Operation N9912A Front Panel Group Front Panel Group The front panel group consists of the following assemblies: • A3 Front Panel Interface Board • A2 LCD Assembly Refer to Figure 5-1 for a simplified overall block diagram which includes the front panel group.

  • Page 46: A2 Lcd Assembly

    Theory of Operation RF Analyzer Front Panel Group N9912A system board. The 5 volts produced is used on the A3 front panel interface board and the A5 system board. The 3.5 volts produced is used on the A3 front panel interface board, the A5 system board, and the A6 SOM board.

  • Page 47: Measurement Group

    RF Analyzer Theory of Operation N9912A Measurement Group Measurement Group The measurement group produces a stable output signal by phase locking a synthesized voltage-controlled oscillator (VCO). The measurement group consists of the: • A4 RF Board • A5 System Board •...
  • Page 48 Theory of Operation RF Analyzer Measurement Group N9912A Figure 5-2 Simplified RF Block Diagram Service Guide N9912-90003...
  • Page 49 RF Analyzer Theory of Operation N9912A Measurement Group CAT/NA RF Section In this section, the 30 MHz time base from the A5 system board is used to generate a source signal in the source synthesizer that covers the frequency range of 100 kHz to 6.2 GHz.
  • Page 50 Theory of Operation RF Analyzer Measurement Group N9912A Spur avoidance is accomplished by slightly shifting the output frequency of the first converter stage. When the output frequency of the first converter is shifted, the second converter compensates for the shift.
  • Page 51 RF Analyzer Theory of Operation N9912A Measurement Group unlock signals. Serial Bus [B] allows the System Monitor on the A5 system board to read two temperature sensors and the ID EPROM for the A4 RF board. RF1 temperature sensor (NA Temp Sensor) is near the RF OUT connector on the side of the A4 RF board that is away from the A5 system board.

  • Page 52: A5 System Board

    Theory of Operation RF Analyzer Measurement Group N9912A A5 System Board The A5 system board controls all of the functions of the analyzer and digitizes the RF IF signal from the A4 RF board. The A6 SOM (System on Module) board is mounted directly on the A5 system board.
  • Page 53 RF Analyzer Theory of Operation N9912A Measurement Group except for power sequencing. This circuitry also monitors the Ext DC input and, if below 10.8 volts or above 21 volts, it disconnects this input from the Unreg DC. There are two DC power supply lines: (1) Ext DC, and (2) Batt +. Each has a 5 amp fuse immediately after the connector on the printed circuit board.
  • Page 54 Theory of Operation RF Analyzer Measurement Group N9912A SOM Connector Refer to “A6 SOM Board” on page 5-16 for information on SOM (System on Module) functions. 5-14 Service Guide N9912-90003...
  • Page 55 RF Analyzer Theory of Operation N9912A Measurement Group Figure 5-3 Simplified RF Block Diagram Service Guide N9912-90003 5-15...

  • Page 56: A6 Som Board

    Theory of Operation RF Analyzer Measurement Group N9912A A6 SOM Board The A6 SOM (System on Module) board plugs directly into the A5 system board as a daughter board and contains: • the CPU, • 64 MB of flash ROM, •...

  • Page 57: Grounding And Power

    RF Analyzer Theory of Operation N9912A Grounding and Power Grounding and Power Grounding Each printed circuit board has a single ground plane. The ground planes on the A4 RF board and A5 system board are connected via the common shields at multiple points. The ground plane on the A3 front panel interface board is connected to the ground plane on the A5 system board.

  • Page 58: Battery Related Information

    Theory of Operation RF Analyzer Grounding and Power N9912A Off Only the System Monitor and battery control circuits are powered up (if power is available from the battery or external power). If the battery is charging, the LED below the On/Off Button slowly flashes orange with increasing intensity, otherwise this LED is off.
  • Page 59 RF Analyzer Theory of Operation N9912A Grounding and Power The battery has built-in sensors, a processor, and control circuitry. This is referred to as the Smart Battery circuitry. The Smart Battery circuitry communicates battery condition and history information digitally via a digital Smart Batt Bus.

  • Page 60: Operation In Modes

    Theory of Operation RF Analyzer Operation in Modes N9912A Operation in Modes The FieldFox User’s Guide 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 And Na Modes

    RF Analyzer Theory of Operation N9912A Operation in Modes suspended. CAT and NA Modes CAT and NA modes have some similar capabilities but are still separate operating modes. Measurement similarities: • Return Loss = S11 magnitude • Insertion Loss = S21 magnitude Unlike S11 and S21, the values displayed below zero for Return Loss and Insertion Loss are not negative.
  • Page 62 Theory of Operation RF Analyzer Operation in Modes N9912A Single sweep measures both NA-A and NA-R signals. Because two ADC’s are used simultaneously, phase relationship is preserved. (Phase information is available to the user only in NA mode.) Details About Two Port Measurements Refer to the block diagram below showing the signal paths highlighted in color.

  • Page 63: Sa Mode

    RF Analyzer Theory of Operation N9912A Operation in Modes The RF In Atten is not under user control. For a given frequency, the ADC Overload Adjustment determines the setting for this attenuator to prevent over-range warnings. There is no default calibration for two port measurements. Uncalibrated (not normalized) measurement of a short thru cable typically shows a trace with some sawtooth characteristics.

  • Page 64: Temperature Related Information

    Theory of Operation RF Analyzer Temperature Related Information N9912A Temperature Related Information Five temperature sensors are in the analyzer: two on the A4 RF board, two on the A5 system board, and one in the battery pack. • RF1—NA Temp Sensor (on the A4 RF board near the NA circuitry) •...

  • Page 65: User Calibration In Cat And Na Modes

    RF Analyzer Theory of Operation N9912A 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 FieldFox User’s Guide “Calibration for CAT and NA Modes”...

  • Page 66: Two Port Calibration

    Theory of Operation RF Analyzer User Calibration in CAT and NA Modes N9912A Two Port Calibration Two port calibration applies only when S21 or Insertion Loss measurements are active. There is no “built-in” or “preset” two port calibration in the analyzer. A normalize calibration must be performed before making two port measurements.

  • Page 67: Firmware Related Information

    RF Analyzer Theory of Operation N9912A Firmware Related Information Firmware Related Information General Description The analyzer is based on the Windows CE operating system. This is a closed system; no direct user access to the desktop of general operating system functions is provided.

  • Page 68: Firmware Upgrades

    Theory of Operation RF Analyzer Firmware Related Information N9912A The error log is cleared each time the analyzer is powered off. Generally, an entry in the error log is created whenever an error message is displayed. EXAMPLE: Attempting to set the frequency to a value of “.” (a decimal point), will generate an entry in the error log.

  • Page 69: Lan Interface

    RF Analyzer Theory of Operation N9912A LAN Interface LAN Interface See the “System Configuration” section of the FieldFox User’s Guide for details on reviewing and configuring LAN settings. Currently the LAN interface supports only communication for the Data Link software and sending SCPI commands for service purposes.
  • Page 70 Theory of Operation RF Analyzer LAN Interface N9912A 5-30 Service Guide N9912-90003...

  • Page 71: Replaceable Parts

    Replaceable Parts Service Guide N9912-90003...

  • Page 72: Information In This Chapter

    Information in This Chapter This chapter: • identifies the replaceable parts for the N9912A RF 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 73: 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 2-5. To order a part that is not listed in the replaceable parts lists: •...

  • Page 74: Assembly Replacement Procedure

    Replaceable Parts RF Analyzer Assembly Replacement Procedure N9912A Assembly Replacement Procedure The following steps describe how to replace an assembly in the analyzer. Step 1. Identify the faulty group. Begin with Chapter 4, “Troubleshooting.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly.

  • Page 75: Replaceable Parts Listings

    RF Analyzer Replaceable Parts N9912A Replaceable Parts Listings Replaceable Parts Listings Entire Analyzer Figure 6-1 Entire Analyzer , Exploded View Descriptions and part numbers for the assemblies and parts in each group shown in the above illustration can be found at the following locations: •...

  • Page 76: Front Panel Group

    N9912-20038 Gap pad, LCD shield (11) 1420-0536 Battery, Lithium-ion (For Real Time Clock (RTC) backup.) 1. Each time the N9912A case is opened for any reason, you must order a Repair and Re-assembly Kit. See “Miscellaneous Parts” on page 6-14.
  • Page 77 RF Analyzer Replaceable Parts N9912A Replaceable Parts Listings Figure 6-2 Front Panel Group, Exploded View Service Guide N9912-90003...

  • Page 78: Measurement Group

    (31) 0515-0374 Screw, machine w/crest cup washer, pan head, M3.0 x 10 mm Repair and Re-assembly Kit Each time the N9912A case is opened for any reason, you must order a . See “Miscellaneous Parts” on page 6-14. Service Guide N9912-90003...
  • Page 79 RF Analyzer Replaceable Parts N9912A Replaceable Parts Listings Reference Designator Part Number Description (32) 0515-0430 Screw, machine w/crest cup washer, pan head, M3.0 x 6 mm (33) 0515-1940 Screw, machine w/patch lock, pan head, M2.5 x 6 mm (34) 0515-2349 Screw, machine, 90-deg flat head, M3.0 x 14 mm...
  • Page 80 Replaceable Parts RF Analyzer Replaceable Parts Listings N9912A Figure 6-3 Measurement Group, Exploded View 6-10 Service Guide N9912-90003...

  • Page 81: Case Group

    Screw, machine, 90-deg flat head, M3.0 x 5 mm (22) 0515-1521 Strap handle (23) N9910-80002 1. Each time the N9912A case is opened for any reason, you must order a Repair and Re-assembly Kit. See “Miscellaneous Parts” on page 6-14. Service Guide N9912-90003...
  • Page 82 Replaceable Parts RF Analyzer Replaceable Parts Listings N9912A Reference Designator Part Number Description Blank side panel (24) W1312-40056 Dowel pins (25) 1480-0793 Door, top (USB) (26) W1312-60048 Door, middle (SD) (27) W1312-60049 Door, bottom (LAN) (28) W1312-60050 Hinge spacer (see Figure 6-5).
  • Page 83 RF Analyzer Replaceable Parts N9912A Replaceable Parts Listings Figure 6-5 Hinge Spacer Locations Service Guide N9912-90003 6-13...

  • Page 84: Miscellaneous Parts

    Repair and Re-assembly Kit IMPORTANT This kit is required each time the N9912A 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 85: Repair And Replacement Procedures

    Repair and Replacement Procedures Service Guide N9912-90003...

  • Page 86: Information In This Chapter

    Repair and Replacement Procedures RF Analyzer Information in This Chapter N9912A Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your Keysight Technologies PNA series microwave network analyzer. Chapter Seven at-a-Glance Section Title Summary of Content...

  • Page 87: Personal Safety Warnings

    RF Analyzer Repair and Replacement Procedures N9912A Personal Safety Warnings Personal Safety Warnings WARNING These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so.

  • Page 88: Assembly Replacement Sequence

    Repair and Replacement Procedures RF Analyzer Assembly Replacement Sequence N9912A Assembly Replacement Sequence The following steps show the sequence that you should follow to replace an assembly in the network analyzer. Step 1. Identify the faulty group. Begin with Chapter 4, “Troubleshooting.”...

  • Page 89: Removing And Replacing The Main Battery

    RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Main Battery Removing and Replacing the Main Battery Tools Required • None IMPORTANT Refer to “Battery Disposal” on page 1-7 for important instructions on disposing of the old battery.

  • Page 90: Removing And Replacing The Case Group Parts

    Repair and Replacement Procedures RF Analyzer Removing and Replacing the Case Group Parts N9912A Removing and Replacing the Case Group Parts Tools Required • T-8 TORX driver (set to 6 in-lb) • T-10 TORX driver (set to 9 in-lb) • Isopropyl alcohol (Use only in a well ventilated area.) •...
  • Page 91 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Case Group Parts 2. To replace the entire kickstand assembly: a. Lift the kickstand assembly off of the rear case and discard it. b. Place the new kickstand assembly on the rear case.
  • Page 92 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Case Group Parts N9912A Separating the Front and Rear Cases 1. Remove the battery. Refer to “Removing and Replacing the Main Battery” on page 7-5. 2. Loosen the six screws (item 3) that secure the RF top panel. It should not be necessary to remove these screws, just loosen them.
  • Page 93 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Case Group Parts 4. Separate the cases and position the rear case to one side, as shown in Figure 7-5, to allow access to the blank side panel and strap handle.
  • Page 94 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Case Group Parts N9912A 7. Position the cases side-by-side as shown in Figure 7-6. 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.
  • Page 95 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Case Group Parts Replacing the Battery Cable 1. Separate the front and rear cases. See “Separating the Front and Rear Cases” on page 7-8. 2. Note the orientation of the cable for installation of the new cable, then, using a small flat-blade screwdriver to move the cable connector, release the retention clips on the cable connector and remove the cable from the rear case.
  • Page 96 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Case Group Parts N9912A 4. Reinstall the rear case onto the front case. See Combining the Front and Rear Cases. Replacing the I/O Side Panel, Doors, and Gasket 1. Separate the front and rear cases. See “Separating the Front and Rear Cases”...
  • Page 97 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Case Group Parts 4. Remove the three doors from the old I/O side panel: a. Open each door to its stopping point, then GENTLY force it beyond its stopping point to separate it from the panel.
  • Page 98 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Case Group Parts N9912A Replacing the Front Case (including the A1 Keypad) 1. Separate the front and rear cases. See Separating the Front and Rear Cases. 2. Remove the measurement group assemblies (RF top panel assembly, A4 RF board, A5 system board, and A6 SOM board) as one unit with the I/O panel attached.
  • Page 99 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Case Group Parts Combining the Front and Rear Cases 1. Install a new gasket on the blank side panel being careful not to stretch it or to damage it in any way.
  • Page 100 RF Analyzer Removing and Replacing the Case Group Parts N9912A 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.
  • Page 101 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Case Group Parts 8. Position the rear case directly over, and aligned with, the front case and the side panels as shown. 9. Make sure the battery cable is tucked in between the measurement group assemblies and the blank side panel and that it is not in the path of the screw hole indicated.

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

    Repair and Replacement Procedures RF Analyzer Removing and Replacing the Front Panel Group Assemblies N9912A Removing and Replacing the Front Panel Group Assemblies Tools Required • T-8 TORX driver (set to 6 in-lb) • T-10 TORX driver (set to 9 in-lb) •...
  • Page 103 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Front Panel Group Assemblies water-tight integrity. 6. Reinstall the RPG knob. Refer to step of this procedure. 7. Perform the steps under “Post-replacement Procedure” on page 7-24. Figure 7-14...
  • Page 104 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Front Panel Group Assemblies N9912A Replacing the A2 LCD, the LCD Shield, and LCD Cables 1. Perform the steps under “Pre-replacement Procedure” on page 7-18. 2. To replace the LCD shield: a.
  • Page 105 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Front Panel Group Assemblies Figure 7-15 Replacing the A2 LCD, the LCD Shield, and LCD Cables Service Guide N9912-90003 7-21...
  • Page 106 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Front Panel Group Assemblies N9912A Replacing the A3 Front Panel Interface Board (FPIB) IMPORTANT The A3 front panel interface board contains a Lithium-ion battery. Refer to “Battery Disposal” on page 1-7 for important instructions on disposing of this printed circuit board with the battery attached.
  • Page 107 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Front Panel Group Assemblies Figure 7-16 Replacing the A3 Front Panel Interface Board Service Guide N9912-90003 7-23...
  • Page 108 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Front Panel Group Assemblies N9912A Replacing the Real Time Clock (RTC) Battery Located on the A3 Front Panel Interface Board (FPIB) IMPORTANT The RTC battery is a Lithium-ion battery and must be disposed of properly. Refer to “Battery...

  • Page 109: Removing And Replacing The Measurement Group Assemblies

    NOTE If the FieldFox serial number is below xx4910xxxx, and either the A5 System board or the RF assembly is being replaced, see Keysight Service Note N9912A-03. It may be necessary to replace both assemblies at the same time. Removing All Measurement Group Assemblies as One Unit 1.
  • Page 110 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Measurement Group Assemblies N9912A Figure 7-18 Removing All Measurement Group Assemblies as One Unit 7-26 Service Guide N9912-90003...
  • Page 111 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Measurement Group Assemblies Replacing the RF Top Panel Assembly 1. Separate the front and rear cases. Refer to “Separating the Front and Rear Cases” on page 7-8. 2. Remove all measurement group assemblies as one unit. Refer to “Removing All Measurement Group...
  • Page 112 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Measurement Group Assemblies N9912A Replacing the Type-N RF Connectors and RF Cables 1. Separate the front and rear cases. See “Separating the Front and Rear Cases” on page 7-8. 2. Remove all measurement group assemblies as one unit. Refer to “Removing All Measurement Group...
  • Page 113 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Measurement Group Assemblies Replacing the A6 SOM Board and Flexible RF Cables 1. Separate the front and rear cases. Refer to “Separating the Front and Rear Cases” on page 7-8.
  • Page 114 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Measurement Group Assemblies N9912A Figure 7-21 Replacing the A6 SOM Board and Flexible RF Cables 7-30 Service Guide N9912-90003...
  • Page 115 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Measurement Group Assemblies Replacing the A5 System Board 1. Separate the front and rear cases. See “Separating the Front and Rear Cases” on page 7-8. 2. Remove all measurement group assemblies as one unit. Refer to “Removing All Measurement Group...
  • Page 116 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Measurement Group Assemblies N9912A Figure 7-22 Replacing the A5 System Board 7-32 Service Guide N9912-90003...
  • Page 117 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Measurement Group Assemblies Replacing the RF Assembly Including the A4 RF Board 1. Separate the front and rear cases. Refer to “Separating the Front and Rear Cases” on page 7-8.
  • Page 118 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Measurement Group Assemblies N9912A Figure 7-23 Replacing the RF Assembly Including the A4 RF Board 7-34 Service Guide N9912-90003...
  • Page 119 RF Analyzer Repair and Replacement Procedures N9912A Removing and Replacing the Measurement Group Assemblies Reinstalling All Measurement Group Assemblies as One Unit 1. Reinstall the I/O side panel, if needed. Refer to “Replacing the I/O Side Panel, Doors, and Gasket” on page 7-12.
  • Page 120 Repair and Replacement Procedures RF Analyzer Removing and Replacing the Measurement Group Assemblies N9912A Figure 7-24 Replacing All Measurement Group Assemblies as One Unit 7-36 Service Guide N9912-90003...

  • Page 121: Post-Repair Procedures

    RF Analyzer Repair and Replacement Procedures N9912A Post-Repair Procedures Post-replacement Procedure 1. Reinstall the measurement group assemblies into the front case. Refer to “Reinstalling All Measurement Group Assemblies as One Unit” on page 7-35. 2. Combine the front and rear cases. Refer to “Combining the Front and Rear Cases”...

  • Page 122: Manual Checks And Procedures

    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. 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 123: General Purpose Maintenance And Service Procedures

    General Purpose Maintenance and Service Procedures Service Guide N9912-90003...

  • Page 124: Information In This Chapter

    General Purpose Maintenance and Service Procedures RF Analyzer Information in This Chapter N9912A Information in This Chapter Chapter Eight at-a-Glance Section Title Summary of Content Start Page Service Related User Operations How to: page 8-3 • view options currently installed on your analyzer •...

  • Page 125: Service Related User Operations

    RF Analyzer General Purpose Maintenance and Service Procedures N9912A Service Related User Operations Service Related User Operations To View Currently Installed Options • Press System(7). • Press System Configuration. • Press Options. • Press Show Options. A list of the currently installed options is displayed.

  • Page 126: Erase User Data Utility

    General Purpose Maintenance and Service Procedures RF Analyzer Service Related User Operations N9912A See the “Temperature Related Information” section of Chapter 5 for details. Erase User Data Utility • Press System(7). • Press Service Diagnostics. • Press Advanced. • Press Erase User Data.

  • Page 127: Options

    2. Within two working days, you will receive an email response with a license file attached. 3. Copy the license file to the root of a USB flash drive. Follow the appropriate instructions in the N9912A Upgrade Installation Instructions (N9912-90005) to install the licenses. These instructions are available by searching for “N9912-90005”...

  • Page 128: Firmware Upgrades

    • Press System Information. The current firmware version is indicated on the “Firmware Release” line. For information on upgrading FieldFox firmware, go to www.keysight.com/find/fieldfox2. If the firmware upgrade process is interrupted, memory contents in the instrument may become corrupted. If a problem is suspected, consider doing a fresh installation of the firmware.

  • Page 129: Miscellaneous Service And Maintenance

    RF Analyzer General Purpose Maintenance and Service Procedures N9912A Miscellaneous Service and Maintenance Miscellaneous Service and Maintenance Cleaning the Display Materials: Use a soft, lint-free cloth. Use a solution with 99.5% IPA (isopropyl alcohol) or a high quality window cleaning solution.
  • Page 130 General Purpose Maintenance and Service Procedures RF Analyzer Miscellaneous Service and Maintenance N9912A Service Guide N9912-90003...
  • Page 131 Option A6J quick reference removal and replacement 7-18 assemblies connectors functional groups replacement care of cautions about contacting Keysight list of procedures CPU board sequence operation 5-16 general safety considerations warnings about removal and replacement 7-25 ground, safety earth...
  • Page 132 Index part number battery 5-16 5-18 replaceable removal and replacement 7-18 battery charging management 5-18 listing of Keysight CAT and NA modes 5-21 ordering information contacting CPU board 5-16 performance support tests, N7841A front panel group kickstand post-repair procedures 7-37...
  • Page 133 CPU board 7-25 warranty analyzer front panel group assemblies 7-18 standard warning LCD shield 7-18 three-year return to Keysight warranty main battery service test equipment service shipment for service or repair measurement group assemblies 7-25 standard smart power management RF assembly...
  • Page 134 Index Index-4 Service Guide N9912-90003...
  • Page 135 This information is subject to change without notice. © Keysight Technologies 2008 - 2014 August 2014 *N9912-90003* N9912-90003 www.keysight.com...

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