Keysight N5221A/22A Service Guide 7-29
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 “Removing the Covers” on page 7-6.
3. Position the analyzer bottom side up.
4. Disconnect ALL ribbon cables (item
①) and ALL wire harnesses (item ➁)
from the A19 test set motherboard.
5. Remove connector hardware (item
③) from 11 rear panel BNC connectors.
(When reinstalling, use a 5/8 inch open end torque wrench set to 21
in-lbs.)
6. Remove connector hardware (item
④) from the rear panel TEST SET I/O
connector. (When reinstalling, use a 3/16 inch open end torque wrench
set to 6 in-lbs.)
7. Remove 10 screws (item
⑤) from the A19 test set motherboard. (When
reinstalling, use a T-10 TORX 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 7-60.
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