7-12 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A18 System Motherboard N5227A
17. Remove the three screws (item ➁) that secure the front bracket to the chassis left inner panel.
18. Remove six screws (item
③
) that secure the A18 system motherboard to the chassis.
19. Slide the A18 system motherboard toward the rear of the analyzer to release it from the 15 keyhole
standoffs (item ④) on the chassis.
20. Lift the A18 system motherboard out of the analyzer.
21. Remove the twelve rubber grommets from the A18 system motherboard guide pins. Keep them for
reinstallation on the replacement motherboard.
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.
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