Keysight N9038A MXE Service Guide 641
Assembly Replacement Procedures
Front Frame Assembly
Daughter Board, Interface Board and Keypad - CCFL Backlight
Removal
1. Refer to Figure 18-78. Remove the RPG knob (5) by carefully pulling it off.
2. Remove the display. Refer to the Display Assembly - CCFL Backlight
removal procedure.
3. Refer to Figure 18-77. Remove the A1A5 Front Panel Daughter board (17)
by removing the three screws (32) (0515-0372) and unplugging it from
the front panel interface board.
4. Remove the thirteen screws (31) (0515-1521) securing the A1A2 Front
Panel Interface board to the Front Frame Assembly. The Front Panel
Interface board with the keypad attached can now be lifted from the Front
Frame Assembly.
5. To separate the keypad from the Front Panel Interface board, use a push
tool or pliers to carefully separate the pull through tabs.
Replacement
1. Install the keypad onto the Front Panel Interface board using the pull
through tabs and alignment holes. Use a push tool or pliers to ensure that
all of the pull through tabs are properly captive on the board.
2. Install the A1A2 Front Panel Interface board/keypad assembly into the
Front Frame Assembly, and replace the thirteen screws (31) (0515-1521)
to secure. Torque to 9 inch pounds.
3. Replace the A1A5 Front Panel Daughter board (17) by plugging it into the
Front Panel Interface board using the board to board connectors and
secure it with the three screws (32) (0515-0372). Torque to 9 inch
pounds.
4. Replace the display. Refer to the Display Assembly - CCFL Backlight
replacement procedure.
5. Replace the RPG knob by firmly pressing it on.
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