Keysight N5227A - Removing and Replacing the A24 if Multiplexer Board

7-24 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A24 IF Multiplexer Board N5227A
Removing and Replacing the A24 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 7-6 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 A23 test set motherboard. Refer to “Removing and Replacing the A23 Test Set
Motherboard” on page 7-22.
5. Disconnect the ribbon cable (item
①
) from the A24 IF multiplexer board.
6. Disconnect ALL gray flexible RF cables (item
➁) from the A24 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 A24 IF multiplexer board.
11. Slide the A24 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 A24 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 7-54.