Keysight N9912A Service Guide 7-29
Repair and Replacement Procedures
Removing and Replacing the Measurement Group Assemblies
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 Kit. Refer to “Miscellaneous Parts” on page 6-12.
Removing All Measurement Group Assemblies as One Unit
a. Separate the front and rear cases. Refer to “Separating the Front
and Rear Cases” on page 7-9.
3. Disconnect the A5 system board to A3 FPIB cable, W14, at the A3 FPIB
connector. If replacing this cable, disconnect both ends.
4. Lift the measurement group assemblies out of the front case and position
them to the side of the front case as shown.
5. 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 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.
Before beginning any repair, remove the battery and disconnect
external power.
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.
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