Removing And Replacing The A20 If Multiplexer Board - Agilent Technologies N5242A 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 (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
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
Set 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
bracket.
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 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
6 in-lbs.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain
to this removal procedure. Refer to
7-28
for this procedure.
"Removing the Covers" on page
7-26.
①
) 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
⑥
) from the A20 IF multiplexer board.
Table 7-2 on page
PNA Series Microwave Network Analyzers
7-6.
"Removing and Replacing the A19 Test
②
) from the A20 IF multiplexer board.
7-68.
Service Guide N5242-90001
N5241A/42A