7-8 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A1–A3 and Other Front Panel Subassemblies N5227A
Removing and Replacing the A1–A3 and Other Front Panel Subassemblies
Tools Required
• T-8 TORX driver (torque to 6 in-lb or 0.68 N.m)
• T-10 TORX driver (torque to 9 in-lb or 1.02 N.m)
• T-20 TORX driver (torque to 21 in-lb or 2.38 N.m)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• ESD grounding wrist strap
Refer to Figure 6-3., “Front Panel Assembly, Back Side, All Options,”, for the following procedures.
Pre-Removal Procedure
1. Disconnect the power cord.
2. Remove the front panel assembly. Refer to “Removing and Replacing the Front Panel Assembly” on page
7-7.
Removing the A1 Front Panel Interface Board and Keypad Assembly
1. Remove the round knob (RPG) from the front panel by gently pulling the knob forward.
2. Remove the four retaining screws (item
⑤
) from the USB board and unplug it from the A1 front panel
interface board.
3. Disconnect the following cables from the A1 front panel interface board: display cable (item
), inverter
board cable (item
⑥), touchscreen controller board cable (item ), and power switch cable (item ).
4. Remove the screws (item
⑤
) from the A3 display assembly and remove it from the front panel assembly.
5. Remove the screws (item
➁) from the A1 front panel interface board and remove it from the front panel
assembly.
6. The keypad assembly can now be removed from the A1 front panel interface board by gently pulling each
of the rubber tabs through the PC board.
Removing the Inverter Board
1. Disconnect the inverter board cable (item ⑥) and the LCD cable (item ) from the inverter board.
2. Remove two screws (item
⑦
) and remove the inverter board.
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