Removing And Replacing The A19 Test Set Motherboard - Keysight N5221A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A19 Test Set Motherboard

Removing and Replacing the A19 Test Set Motherboard
Tools Required
• 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)
• 3/16 inch open-end torque wrench (torque to 6 in-lb or 0.68 N.m)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• 5/8 inch open-end torque wrench (torque to 21 in-lb or 2.38 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-12 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Position the analyzer bottom side up.
4. Disconnect ALL ribbon cables (item
motherboard.
5. Remove connector hardware (item
5/8 inch open end torque wrench set to 21 in-lbs.)
6. Remove connector hardware (item
use a 3/16 inch open end torque wrench set to 6 in-lbs.)
7. Remove 10 screws (item
driver set to 9 in-lbs.)
8. Slide the A19 test set motherboard toward the front of the instrument until the rear panel BNC
connectors are free of the rear panel, then lift the motherboard and remove it from the analyzer.
Replacement Procedure
1. Reverse the order of the removal procedure. In Step 7, loosely reinstall ten screws in the A19 test set
motherboard. After reinstalling connector hardware on the rear panel, torque the ten screws to 9 in-lbs
using the T-10 TORX driver.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page
7-26
"Removing the Covers" on page
①
) and ALL wire harnesses (item
③
) from 11 rear panel BNC connectors. (When reinstalling, use a
④
) from the rear panel TEST SET I/O connector. (When reinstalling,
⑤
) from the A19 test set motherboard. (When reinstalling, use a T-10 TORX
7-56.
PNA Series Microwave Network Analyzers
7-6.
➁
) from the A19 test set
Service Guide N5222-90001
N5221A/22A