Keysight N5227A - Removing and Replacing the A23 Test Set Motherboard

7-22 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A23 Test Set Motherboard N5227A
Removing and Replacing the A23 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)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• 5/8 inch nutsetter (torque to 21 in-lb)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 6-36 on page 6-77 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 A) and ALL wire harnesses (item B) from the A23 test set
motherboard.
5. Remove connector hardware from 11 rear panel BNC connectors.
6. Remove connector hardware from the rear panel TEST SET I/O connector.
7. Remove 10 screws (item C) from the A23 test set motherboard.
8. Slide the A23 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.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page 7-54.