7-26 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A19 Test Set Motherboard N5242A
Removing and Replacing the A19 Test Set Motherboard
Tools Required
• T-10 TORX driver (set to 9 in-lb)
• T-20 TORX driver (set to 21 in-lb)
• 5/16 inch open-end torque wrench (set to 10 in-lb)
• 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
②
) from the
A19 test set motherboard.
5. Remove connector hardware (item
③
) from 11 rear panel BNC connectors.
6. Remove connector hardware (item
④
) from the rear panel TEST SET I/O connector.
7. Remove 10 screws (item
⑤
) from the A19 test set motherboard.
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.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain
to this removal procedure. Refer to Table 7-2 on page 7-64.
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