Keysight N9912A Service Manual page 112

Repair and Replacement Procedures
Removing and Replacing the Front Panel Group Assemblies
Replacing the A3 Front Panel Interface Board (FPIB)
The A3 front panel interface board contains a Lithium-ion battery. Refer to
"Battery Disposal" on page 1-8
this printed circuit board with the battery attached. If necessary, the
battery can be removed from the printed circuit board and disposed of
separately.
1. Perform the steps under
2. Remove the four screws (item 2) that secure the LCD shield and remove
the LCD shield. Discard the four screws, new ones are provided in the
Repair and Re-assembly
and will fall out of the front case if the case is tipped.
3. Disconnect the RPG cable, W12, at the A3 FPIB connector as indicated.
4. Disconnect the A2 LCD to FPIB cable, W113, at the A3 FPIB connector as
indicated.
5. Remove the nine screws (item 3) that secure the A3 FPIB to the front case.
6. Push the nine rubber "nubs" through the A3 FPIB to release the A1 keypad.
The A1 keypad is permanently attached to the front case and must remain.
7. Position the new A3 FPIB in the front case over the A1 keypad and, using
needle-nose pliers, pull the nine rubber "nubs" on the A1 keypad through
the holes in the A3 FPIB. Make sure that all nine of the rubber "nubs" are
fully extended on the back side of the A3 FPIB.
8. Secure the A3 FPIB to the front case with nine new screws (item 3)
provided in the
9. Re-connect theA2 LCD to FPIB cable, W13, to the A3 FPIB connector as
indicated. Route the cable as shown.
10.Re-connect the RPG cable, W12, to the A3 FPIB connector as indicated,
with the A2 LCD to A3 FPIB cable, W13, passing beneath it as shown.
Bend the RPG cable toward the right side as shown.
11.Place the LCD shield back in position on the A2 LCD. Make sure that the
A2 LCD to A3 FPIB cable, W13, is routed between, not under, the shield
gaskets.
12.Secure the shield with four new screws (item 2) provided in the
Re-assembly
13.Perform the steps under
7-26
for important instructions on disposing of
"Pre-replacement Procedure" on page
Kit. Be careful. The A2 LCD display is now loose
Repair and Re-assembly
Kit.
"Post-replacement Procedure" on page
Kit.
Keysight N9912A Service Guide
7-21.
Repair and
7-28.