Keysight N9912A - Removing and Replacing the Front Panel Group Assemblies

Keysight N9912A Service Guide 7-21
Repair and Replacement Procedures
Removing and Replacing the Front Panel Group Assemblies
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)
— 7/16-inch hex nut wrench or “nut driver” (set to 9 in-lb)
— Repair and Re-assembly Kit. Refer to “Miscellaneous Parts” on page 6-12.
— Soldering tool (Required only for RTC battery replacement.)
Pre-replacement Procedure
1. Separate the front and rear cases. Refer to “Separating the Front and Rear
Cases” on page 7-9.
2. Remove the measurement group assemblies (RF top panel, A4 RF board,
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.
Replacing the RPG and RPG Knob
1. Perform the steps under “Pre-replacement Procedure” on page 7-21.
2. Remove the two hole plugs from the back side of the front case, next to
the RPG.
3. To replace the RPG knob:
a. Insert a round shaft, such as a screwdriver shaft, into the exposed
holes and push the RPG knob off of the RPG shaft to the front side of
the front case.
b. Install a new knob by aligning the D-shaped detent in the knob with
the D-shape on the shaft and push the knob into position.
4. To replace the RPG:
a. Remove the RPG knob. Refer to step 3a of this procedure.
b. Disconnect the RPG cable, W12, from the A3 front panel interface
board.
c. 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.
Before beginning any repair, disconnect the power cord.