Removing And Replacing The Front Panel Group Assemblies - Keysight N9912A Service Manual

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
• Soldering tool (Required only for RTC battery replacement.)
WARNING Before beginning any repair, disconnect the power cord.
Pre-replacement Procedure
1. Separate the front and rear cases. Refer to
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
Group Assemblies" on page
Replacing the RPG and RPG Knob
1. Perform the steps under
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
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.
e. To install a new RPG, reverse the above steps. A new cable, nut, and washer are included with the
new RPG. When reinstalling the RPG cable, W12, bend the cable toward the right side on top of the
display to front panel interface board cable.
5. Reinstall the hole plugs in the front case. Apply one drop of isopropyl alcohol on each hole plug to
lubricate it, making it easier to install. Use alcohol only in a well ventilated area. View the hole plugs
from the front to ensure that they are fully seated. These hole plugs must be installed to maintain
7-18
Kit. Refer to "Miscellaneous Parts" on page
"Separating the Front and Rear Cases" on page
7-25.
"Pre-replacement Procedure" on page
3.a of this procedure.
6-14.
"Removing and Replacing the Measurement
7-18.
Service Guide N9912-90003
RF Analyzer
N9912A
7-8.