Removing And Replacing The Measurement Group Assemblies - Keysight N9912A Service Manual

RF Analyzer
N9912A

Removing and Replacing the Measurement Group Assemblies

Tools Required
• T-8 TORX driver (set to 6 in-lb)
• T-10 TORX driver (set to 9 in-lb)
• 5/16-inch open-end torque wrench (set to 10 in-lb)
• 9/16-inch open-end torque wrench (set to 21 in-lb)
• Repair and Re-assembly
WARNING Before beginning any repair, remove the battery and disconnect external power.
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. Separate the front and rear cases. Refer to
2. Disconnect the A5 system board to A3 FPIB cable, W14, at the A3 FPIB connector. If replacing this cable,
disconnect both ends.
3. Lift the measurement group assemblies out of the front case and position them to the side of the front
case as shown.
4. Disconnect the A2 LCD to A5 system board cable, W11, at the A5 system board connector. It is
necessary to first remove the adhesive tape that is over the connector. To replace this cable, refer to
"Replacing the A2 LCD, the LCD Shield, and LCD Cables" on page
5. The measurement group assemblies are now completely separated from the analyzer.
6. To remove the I/O panel, refer to
Service Guide N9912-90003
Removing and Replacing the Measurement Group Assemblies
Kit. Refer to "Miscellaneous Parts" on page
"Separating the Front and Rear Cases" on page
"Replacing the I/O Side Panel, Doors, and Gasket" on page
Repair and Replacement Procedures
6-14.
7-20.
7-8.
7-12.
7-25