Removing And Replacing The A20 If Multiplexer Board - Keysight N5221A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A20 IF Multiplexer Board

Removing and Replacing the A20 IF Multiplexer Board
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)
• 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
3. Position the analyzer bottom side up.
4. Remove the A19 test set motherboard. Refer to
Motherboard" on page
5. Disconnect the ribbon cable (item
6. Disconnect ALL gray flexible RF cables (item
7. Remove connector hardware (item
8. Remove connector hardware (item
9. Remove four screws (item
10. Remove four screws (item
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 multiplexer board 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 6 in-lbs.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page
7-28
"Removing the Covers" on page
"Removing and Replacing the A19 Test Set
7-26.
①
) from the A20 IF multiplexer board.
➁
) from the A20 IF multiplexer board.
③
) from five rear panel RF connectors.
④
) from the rear panel PULSE I/O connector.
⑤
) from the stabilizer bracket and remove the stabilizer bracket.
⑥
) from the A20 IF multiplexer board.
7-56.
PNA Series Microwave Network Analyzers
7-6.
Service Guide N5222-90001
N5221A/22A