Keysight N9912A Service Manual
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Keysight N9912A Service Manual

Keysight N9912A Service Manual

Rf analyzer
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Keysight N9912A RF Analyzer
(2 MHz - 4 GHz)
(2 MHz - 6 GHz)
Notice: This document contains references to Agilent.
Please note that Agilent's Test and Measurement
business has become Keysight Technologies. For
more information, go to www.keysight.com.
Service Guide

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Summary of Contents for Keysight N9912A

  • Page 1 Keysight N9912A RF Analyzer (2 MHz - 4 GHz) (2 MHz - 6 GHz) Notice: This document contains references to Agilent. Please note that Agilent’s Test and Measurement business has become Keysight Technologies. For more information, go to www.keysight.com. Service Guide...
  • Page 2 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 5: Table Of Contents

    Keysight Support, Services, and Assistance ........
  • Page 6 Spectrum Analyzer Specific Tests ......... . . 3-8 Adjustments (Keysight N7841A Software Package) ....... . 3-9 General Adjustments .
  • Page 7 Removal and Replacement Procedures ......... 7-5 Keysight N9912A Service Guide...
  • Page 8 Battery Maintenance ........... . . 8-7 Keysight N9912A Service Guide...

  • Page 9: Safety And Regulatory Information

    Keysight N9912A RF Analyzer 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 10: 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 N9912A Service Guide...

  • Page 11: 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 N9912A Service Guide...
  • Page 12 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 N9912A Service Guide...

  • Page 13: 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 N9912A Service Guide...
  • Page 14 Safety and Regulatory Information Electrostatic Discharge Protection Figure 1-1 ESD Protection Setup Keysight N9912A Service Guide...

  • Page 15: 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 N9912A Service Guide...

  • Page 16: 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 for assistance.

  • Page 17: 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 2-4 Assistance Service and support options available. Calibration options available. Important information about shipping your analyzer to...

  • Page 18: 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 2-5 and to Chapter 3, “Tests and Adjustments.” Keysight N9912A Service Guide...

  • Page 19: Analyzer Options

    General Product Information Analyzer Options 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 for information on currently available upgrade options.

  • Page 20: Keysight Support, Services, And Assistance

    The analyzer’s standard warranty is a one-year return to Keysight Technologies service warranty. There are other repair and calibration options available from Keysight Technologies. Contact Keysight for additional information on available service agreements for this product. Refer to “Contacting Keysight” on page 2-5 Calibration Options Commercial Calibration Certificate with Test Data A complete set of measurements that test the analyzer to the manufacturer’s...

  • 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 Keysight N9912A Service Guide...

  • Page 23: 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 is required to test and adjust your analyzer. This software package must be purchased separately. It can be downloaded from the Internet and a license purchased on-line, or it can be ordered on a CD-ROM.
  • Page 24 Summary of Content Start Page Adjustments (Keysight A list of adjustments included in the Keysight N7841A software page 3-9 N7841A Software package. Package) a. The Keysight N7841A software package must be purchased separately. Go to www.keysight.com/find/calibrationsoftware for information. Keysight N9912A Service Guide...

  • 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 N9912A analyzer, allow it to warm up as described under “DUT 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 N9912A Service Guide...

  • Page 27: Service Test Equipment

    “mini” sized Secure Digital (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 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 N9912A is operating and confirm that the power cord icon is displayed appropriately at the top of the display.

  • Page 29: Operational Check

    Between 30 MHz and 5 GHz, the trace should be below -45 dBm. d. Between 5 GHz and 6 GHz, the trace should be below -35 dBm. If the operational check fails, allow the instrument to warm up for 15 minutes and try again. Keysight N9912A Service Guide...

  • Page 30: 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.

  • Page 31: Adjustments (Keysight N7841A Software Package)

    Tests and Adjustments Adjustments (Keysight N7841A Software Package) 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.
  • Page 32 Tests and Adjustments Adjustments (Keysight N7841A Software Package) 3-10 Keysight N9912A Service Guide...

  • Page 33: Troubleshooting

    Keysight N9912A RF Analyzer 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 34: 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 N9912A Service Guide...

  • Page 35: 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 N9912A Service Guide...

  • 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 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 N9912A Service Guide...

  • Page 38: 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 N9912A Service Guide...

  • Page 39: 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 N9912A Service Guide...

  • 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 Keysight N9912A Service Guide...

  • Page 41: Theory Of Operation

    Keysight N9912A RF Analyzer Service Guide Theory of Operation 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 42: 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 43 Theory of Operation Analyzer System Operation Figure 5-1 Overall Block Diagram Keysight N9912A Service Guide...

  • Page 44: 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 N9912A Service Guide...

  • Page 45: 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 N9912A Service Guide...

  • Page 46: Measurement Group

    25 MHz to 0.2 GHz 0.2 GHz to 0.8 GHz 0.8 GHz to 1.6 GHz 1.6 GHz to 3.2 GHz 3.2 GHz to 3.4 GHz 3.4 GHz to 4.15 GHz 4.15 GHz to 5.1 GHz 5.1 GHz to 6.2 GHz Keysight N9912A Service Guide...
  • Page 47 Theory of Operation Measurement Group Figure 5-2 Simplified RF Block Diagram Keysight N9912A Service Guide...
  • Page 48 The RF In attenuator covers the range of 0 dB to 31 dB in one dB steps. An adjustment determines compensation for each of the 32 steps over 11 frequency bands (see “SA Frequency Bands” on page 5-9).This compensation provides nominal 1.0 dB steps. Keysight N9912A Service Guide...
  • Page 49 (bands 5-11) are considered HIGH bands. Different hardware is used for each type. Band Analyzer Analyzer Start Frequency Stop Frequency (MHz) (MHz) 0.000 10.000 30.000 715.000 715.000 1665.000 1665.000 2700.000 2700.000 3313.500 3313.500 3500.000 3500.000 4263.500 4263.500 4300.000 4300.000 5200.000 5200.000 5936.500 5936.500 6000.000 Keysight N9912A Service Guide...

  • Page 50: A5 System Board

    The A6 SOM (System on Module) board is mounted directly on the A5 system board. All external connections for the analyzer come through the A5 system board except for the RF IN and RF OUT ports. The A5 system board also controls the power switching and power management. 5-10 Keysight N9912A Service Guide...
  • Page 51 This is accomplished through load switching. See “Power Management Circuitry” on page 5-10 more information. The System Monitor controls the on/off functions of the analog power supplies. All are on or off together except for power sequencing. Keysight N9912A Service Guide 5-11...
  • Page 52 The SB2 Temp Sensor is on the A4 RF board side of the A5 system board near the edge of the board against the battery compartment. This temperature sensor is not under a shield. Audio Output Jack When headphones are plugged into the audio output jack, the internal speaker is disabled. 5-12 Keysight N9912A Service Guide...
  • Page 53 The LAN connector supports the LAN interface on the A6 SOM board. See “LAN Interface” on page 5-31 for more details. SOM Connector Refer to “A6 SOM Board” on page 5-15 for information on SOM (System on Module) functions. Keysight N9912A Service Guide 5-13...
  • Page 54 Theory of Operation Measurement Group Figure 5-3 Simplified RF Block Diagram 5-14 Keysight N9912A Service Guide...

  • 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 5-18 for details on the main battery. Keysight N9912A Service Guide 5-15...

  • 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 5-10 for more information. 5-16 Keysight N9912A Service Guide...

  • Page 57: Power Control And Management

    — Source—switched off during SA mode, switched off between sweeps during CAT or NA modes. — LO—switched off when data is not being taken by receivers. — SA—switched off when in one port CAT or NA modes, on all the time in two port mode. Keysight N9912A Service Guide 5-17...

  • Page 58: Battery Related Information

    Refer to the FieldFox User’s Guide for information on how to access this screen. Most of the items displayed on the screen come directly from the battery via the Smart Batt Bus. Only the first three items are influenced by the analyzer. 5-18 Keysight N9912A Service Guide...
  • 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. Keysight N9912A Service Guide 5-19...

  • Page 60: Operation In Modes

    For most screens under System 7 key, the current measurement mode continues to operate while the screen is displayed. For instance, while the battery information screen is displayed, the measurement mode remains active. 5-20 Keysight N9912A Service Guide...

  • Page 61: Cat And Na Modes

    The only user control of output power level is the high/low setting on the RF Out Atten, 30 dB in or out. Details About One Port Measurements Refer to the block diagram below showing the signal paths highlighted in color. Keysight N9912A Service Guide 5-21...
  • Page 62 (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. 5-22 Keysight N9912A Service Guide...
  • Page 63 The SA Pre-amp is always switched out. 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. Keysight N9912A Service Guide 5-23...

  • Page 64: Sa Mode

    The SA adjustments generally correct the gain with 11 frequency bands. See “SA Frequency Bands” on page 5-9 for a listing of the 11 bands. See the TME help file for details on SA adjustments. 5-24 Keysight N9912A Service Guide...

  • Page 65: Power Meter Mode

    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. Keysight N9912A Service Guide 5-25...

  • Page 66: Temperature Related Information

    20 ×C above ambient once the internal temperature has stabilized. It will typically take 60 to 90 minutes for the internal temperature to stabilize when a “cold” unit is turned on. 5-26 Keysight N9912A Service Guide...

  • Page 67: User Calibration In Cat And Na Modes

    The preset calibration provides very good measurement performance at the RF OUT connector when the analyzer has thermally stabilized to room temperature. Operation at other temperature conditions may impact measurement accuracy when applying the preset calibration. Keysight N9912A Service Guide 5-27...

  • Page 68: Two Port Calibration

    QuickCal The QuickCal function mathematically “extends” the preset calibration to the end of a cable or adapter. It is a firmware only function; it does not involve analyzer hardware. 5-28 Keysight N9912A Service Guide...

  • Page 69: Firmware Related Information

    — Cable definition files—stored in UserData\Cables. — Error log—not directly available to user. See “Error Log” further on in this section for accessing error log information. 1. Windows“ and Windows CE“ are U.S. registered trademarks of Microsoft Corpora- tion. Keysight N9912A Service Guide 5-29...

  • Page 70: Erase User Data Utility

    It is important to maintain power to the analyzer during the update process. After unplugging the USB flash memory stick during the firmware upgrade process, wait for the analyzer to activate the CAT mode before operating the analyzer. 5-30 Keysight N9912A Service Guide...

  • Page 71: Lan Interface

    There are two LEDs on the LAN connector. When there is successful communication over a LAN cable, both LEDs are active. If both LEDs are not active, consider using a cross-over cable. Keysight N9912A Service Guide 5-31...
  • Page 72 Theory of Operation LAN Interface 5-32 Keysight N9912A Service Guide...

  • Page 73: Replaceable Parts

    Replaceable Parts 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 74: 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 2-5.

  • Page 75: 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 N9912A Service Guide...

  • Page 76: 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 N9912A Service Guide...
  • Page 77 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 6-12.
  • Page 78 Replaceable Parts Replaceable Parts Listings Figure 6-2 Front Panel Group, Exploded View Keysight N9912A Service Guide...
  • Page 79 Pre-programmed CPU Board (CPU2) N9927-60100 N9912-60019 System gasket assembly, 2 gaskets for A5 system board 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 6-12.
  • Page 80 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 a. For Fieldfox Analyzer with serial number prefix starting with MY5607/SG5607/US5607. Keysight N9912A Service Guide...
  • Page 81 Replaceable Parts Replaceable Parts Listings Figure 6-3 Measurement Group, Exploded View Keysight N9912A Service Guide...
  • Page 82 N9912-40006 Hole plugs (22) 0515-1521 Screw, machine, 90-deg flat head, M3.0 x 5 mm 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 6-12. 6-10...
  • Page 83 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 N9912A Service Guide 6-11...

  • 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 5/16 inch, open-end torque wrench; set to 10 in-lb 7/16 inch, hex nut wrench or “nut driver”; set to 9 in-lb 9/16 inch, open-end torque wrench; set to 21 in-lb Documentation Users’ Guide. Can also be printed from the Keysight Web site. N9912-90001 Quick Reference Guide N9912-90002 Service Guide.
  • Page 86 Replaceable Parts Replaceable Parts Listings 6-14 Keysight N9912A Service Guide...

  • Page 87: Repair And Replacement Procedures

    Keysight N9912A RF Analyzer Service Guide Repair and Replacement Procedures 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 88: 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 N9912A Service Guide...

  • Page 89: 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 N9912A Service Guide...

  • Page 90: 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 N9912A Service Guide...

  • Page 91: Removal And Replacement Procedures

    Backup battery for real time clock (Soldered onto the A3 front panel interface page 7-27 battery board.) Main battery Primary power battery page 7-6 Keypad page 7-26 page 7-22 Front panel interface board page 7-26 RF board page 7-29 System board page 7-29 SOM board page 7-29 Keysight N9912A Service Guide...

  • Page 92: 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 N9912A Service Guide...

  • Page 93: 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 N9912A Service Guide...
  • Page 94 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 N9912A Service Guide...
  • Page 95 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 N9912A Service Guide...
  • Page 96 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 N9912A Service Guide...
  • Page 97 Figure 7-15 on page 7-25. To remove the LCD shield, follow step 2a on page 7-22. If the two strips of adhesive tape are not in place, install them by following step 2h on page 7-23. Keysight N9912A Service Guide 7-11...
  • Page 98 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. 7-12 Keysight N9912A Service Guide...
  • Page 99 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 N9912A Service Guide 7-13...
  • Page 100 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 N9912A Service Guide...
  • Page 101 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 N9912A Service Guide 7-15...
  • Page 102 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 N9912A Service Guide...
  • Page 103 “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 N9912A Service Guide 7-17...
  • Page 104 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 N9912A Service Guide...
  • Page 105 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 N9912A Service Guide 7-19...
  • Page 106 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 N9912A Service Guide...

  • Page 107: 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 N9912A Service Guide 7-21...
  • Page 108 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 N9912A Service Guide...
  • Page 109 7-15. Press down firmly on the tape to conform it to the contours of the connectors and to ensure proper adhesion. The strip of adhesive tape is part of the N9912-60027 Repair and Re-assembly Kit. Keysight N9912A Service Guide 7-23...
  • Page 110 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 7-28. 7-24 Keysight N9912A Service Guide...
  • Page 111 Repair and Replacement Procedures Removing and Replacing the Front Panel Group Assemblies Figure 7-15 Replacing the A2 LCD, the LCD Shield, and LCD Cables Keysight N9912A Service Guide 7-25...
  • Page 112 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 7-28. 7-26 Keysight N9912A Service Guide...
  • Page 113 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. A soldering tool is required for this procedure. Keysight N9912A Service Guide 7-27...
  • Page 114 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 7-29. 2. Combine the front and rear cases. Refer to “Combining the Front and Rear Cases” on page 7-17. 7-28 Keysight N9912A Service Guide...

  • Page 115: Removing And Replacing The Measurement Group Assemblies

    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 Separate the front and rear cases.
  • Page 116 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-18 Removing All Measurement Group Assemblies as One Unit 7-30 Keysight N9912A Service Guide...
  • Page 117 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 7-43. Figure 7-19 Replacing the RF Top Panel Assembly Keysight N9912A Service Guide 7-31...
  • Page 118 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 7-43. 7-32 Keysight N9912A Service Guide...
  • Page 119 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. Keysight N9912A Service Guide 7-33...
  • Page 120 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 7-43. 7-34 Keysight N9912A Service Guide...
  • Page 121 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-21 Replacing the A6 SOM Board and Flexible RF Cables Keysight N9912A Service Guide 7-35...
  • Page 122 ). 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 7-33. 7-36 Keysight N9912A Service Guide...
  • Page 123 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 7-43. Keysight N9912A Service Guide 7-37...
  • Page 124 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-22 Replacing the A5 System Board 7-38 Keysight N9912A Service Guide...
  • Page 125 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 7-33. 8. Perform the steps under “Post-replacement Procedure” on page 7-43. Keysight N9912A Service Guide 7-39...
  • Page 126 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-23 Replacing the RF Assembly Including the A4 RF Board 7-40 Keysight N9912A Service Guide...
  • Page 127 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. Keysight N9912A Service Guide 7-41...
  • Page 128 Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7-24 Replacing All Measurement Group Assemblies as One Unit 7-42 Keysight N9912A Service Guide...
  • Page 129 1. Reinstall the measurement group assemblies into the front case. Refer to “Reinstalling All Measurement Group Assemblies as One Unit” on page 7-41. 2. Combine the front and rear cases. Refer to “Combining the Front and Rear Cases” on page 7-17. Keysight N9912A Service Guide 7-43...

  • Page 130: 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. 7-44 Keysight N9912A Service Guide...
  • Page 131 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 132: Processor Upgrade Procedures

    (item 5) to secure the A5 system board to the RF bottom shield. 14.Torque these ten screws in the sequence shown by the circled numbers ➊➐➓ ). Repeat this torque sequence one additional time. 7-46 Keysight N9912A Service Guide...
  • Page 133 Refer to Figure 7-26 for the new nameplate with red Keysight logo. 21.Proceed “Post-Repair Procedures” on page 7-44 . Download and install the latest Firmware for the CPU2 from FieldFox Series Firmware Updates.
  • Page 134 Repair and Replacement Procedures Processor Upgrade Procedures 7-48 Keysight N9912A Service Guide...

  • Page 135: General Purpose Maintenance And Service Procedures

    Keysight N9912A RF Analyzer Service Guide General Purpose Maintenance and Service Procedures Information in This Chapter Chapter Eight at-a-Glance Section Title Summary of Content Start Page Service Related User Operations How to: page 8-2 — view options currently installed on your analyzer —...

  • Page 136: 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 N9912A Service Guide...

  • Page 137: Erase User Data Utility

    — Press Erase User Data. — Press Confirm Erase. The UserData 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 N9912A Service Guide...

  • Page 138: Options

    A6 SOM board. Process for obtaining and re-installing options: 1. Send an email to ctd-soco_support@keysight.com with the following information. — Indicate that you need previously issued licensed for a FieldFox repair.
  • Page 139 For information on acquiring additional options, go to www.keysight.com/find/fieldfox2 and follow the “Upgrades available for FieldFox N9912A” link. There is an installation note associated with each option upgrade that provides detailed instructions. Some combinations of options are not valid; see the web information for details.

  • Page 140: 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 N9912A Service Guide...

  • Page 141: Miscellaneous Service And Maintenance

    Battery Maintenance See the “Working with the Lithium-Ion Battery” section of the FieldFox User’s Guide for information on the removable battery. In particular, see “Built-In Battery Gauge” and “Reconditioning the Battery”. Keysight N9912A Service Guide...
  • Page 142 General Purpose Maintenance and Service Procedures Miscellaneous Service and Maintenance Keysight N9912A Service Guide...
  • Page 143 5-29 assemblies caution replacement protection CE mark , 1-5, 3-3, 4-2, cautions about supplies check part numbers list of procedures operational 6-13 checklist sequence , 6-3, before return to customer warnings about checks and procedures Keysight N9912A Service Guide...
  • Page 144 7-44 procedures ISM1-A mark 7-44 service and support measurement group ISO 17025 standards Option 1A7 operation compliant calibration, ISO 17025 standards troubleshooting Option 1A7 compliant calibration measurement group Option A6J assemblies Keysight N9912A Service Guide...
  • Page 145 Keysight 5-16 CPU board 7-29 erase user data utility states 5-16 front panel group options supplies 5-16 assemblies 7-21 procedures pre-repair LCD shield 7-21 caution about procedures Keysight N9912A Service Guide...
  • Page 146 6-13 support contacting Keysight options system board operation 5-10 temperature battery pack 5-26 related information 5-26 screen 5-26 test equipment service tests performance, N7841A tools service, part numbers 6-12 troubleshooting Keysight N9912A Service Guide...
  • Page 147 This information is subject to change without notice. © Keysight Technologies 2008 - 2018 August 2018 *N9912-90003* N9912-90003 www.keysight.com...

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