Removing And Replacing The Front Panel Group Assemblies - Agilent Technologies FieldFox N9923AN 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
Before beginning any repair, disconnect the power cord.
WARNING
Pre-replacement Procedure
1. Separate the front and rear cases. Refer to
page 7-8.
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
and Replacing the Measurement 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 water-tight integrity.
7-18
Kit. Refer to "Miscellaneous Parts" on page
"Separating the Front and Rear Cases" on
"Pre-replacement Procedure" on page
3.a of this procedure.
RF Vector Network Analyzer
N9923AN
6-12.
"Removing
7-25.
7-18.
Service Guide N9923-90005