Agilent Technologies N5242A - Removing and Replacing the A20 if Multiplexer Board

7-28 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A20 IF Multiplexer Board N5242A
Removing and Replacing the A20 IF Multiplexer Board
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 7-13 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. Remove the A19 test set motherboard. Refer to “Removing and Replacing the A19 Test
Set Motherboard” on page 7-26.
5. Disconnect the ribbon cable (item
①
) from the A20 IF multiplexer board.
6. Disconnect ALL gray flexible RF cables (item
②
) from the A20 IF multiplexer board.
7. Remove connector hardware (item
③
) from five rear panel RF connectors.
8. Remove connector hardware (item
④
) from the rear panel PULSE I/O connector.
9. Remove four screws (item
⑤
) from the stabilizer bracket and remove the stabilizer
bracket.
10. Remove four screws (item
⑥
) from the A20 IF multiplexer board.
11. Slide the A20 IF multiplexer board toward the front of the instrument until the rear
panel 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.
Attach the stabilizer bracket to the new A20 IF multiplexer board using the screws
removed from the old one.
Torque rear panel RF connector nuts to 21 in-lbs and PULSE I/O connector screws to
6in-lbs.
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.