Removing And Replacing The A33 Reference Mixer Switch - Keysight N5221A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A33 Reference Mixer Switch

Removing and Replacing the A33 Reference Mixer Switch
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 7-19 for this procedure.
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing of the cables
is necessary to remove assemblies but do not over-bend them.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Position the analyzer bottom side up.
4. Disconnect four semirigid cables (item
5. Remove three screws (item
deck.
6. Move the disconnected semirigid cables out of the way and lift the A33 reference mixer switch and
mounting bracket out of the analyzer.
7. Disconnect the wire harness cable (item
8. Remove four screws (item
Replacement Procedure
1. Reverse the order of the removal procedure.
When reinstalling the A33 reference mixer switch into the analyzer, loosely install the three mounting
➁
screws (item ). Connect the four semirigid cables (item
then tighten the three mounting screws.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page
7-40
"Removing the Covers" on page
①
) from the A33 reference mixer switch.
➁
) that secure the A33 reference mixer switch to the side of the test set
③
) from the A33 reference mixer switch.
④
) that attach the A33 reference mixer switch to its mounting bracket.
7-56.
PNA Series Microwave Network Analyzers
7-6.
①
) and torque the connectors to 10 in-lbs,
Service Guide N5222-90001
N5221A/22A