Removing And Replacing The A1-A3 And Other Front Panel Subassemblies - Keysight N5221A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A1–A3 and Other Front Panel Subassemblies
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 7-3, Figure
Pre-removal Procedure
1. Disconnect the power cord.
2. Remove the front panel assembly. Refer to
7-8.
Removing the A2 USB Board
1. Remove the four retaining screws (item
interface board.
Removing the A1 Front Panel Interface Board and Keypad Assembly
1. Remove the A2 USB board as outlined above.
2. Remove the round knob (RPG) from the front panel by gently pulling the knob forward.
3. Disconnect the following cables from the A1 front panel interface board: display cable (item
③
board cable (item ), touchscreen controller board cable (item
4. Remove the nine screws (item
panel assembly.
5. 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
2. Remove two screws (item
7-10
7-4, and Figure 7-5 for the following procedures.
"Removing and Replacing the Front Panel Assembly" on page
①
) from the USB board and unplug it from the A1 front panel
⑥
) from the A1 front panel interface board and remove it from the front
③
) and the LCD cable (item
⑧
) and remove the inverter board.
PNA Series Microwave Network Analyzers
④
), and power switch cable (item
⑦
) from the inverter board.
Service Guide N5222-90001
N5221A/22A
➁
), inverter
⑤
).