Keysight Technologies N5221A

7-10 Keysight N5221A/22A Service Guide
Repair and Replacement Procedures
Removing and Replacing the A1–A3 and Other Front Panel Subassemblies
7-
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 7-4, and Figure 7-5 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 7-8.
Removing the A2 USB Board
1. Remove the four retaining screws (item ①) from the USB board and
unplug it from the A1 front panel 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
➁), inverter board cable (item ③), touchscreen
controller board cable (item
④), and power switch cable (item ⑤).
4. Remove the nine screws (item
⑥) from the A1 front panel interface board
and remove it from the front 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 ③) and the LCD cable (item ⑦)
from the inverter board.
2. Remove two screws (item
⑧) and remove the inverter board.
Removing the Touchscreen Controller Board