7-36 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A37 Reference Mixer Switch N5227A
Removing and Replacing the A37 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 7-13 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 the assembly. However, do not over-bend the semirigid cables.
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. Disconnect four semirigid cables (item
①
) from the A37 reference mixer switch.
5. Remove two screws (item
➁) that secure the A37 reference mixer switch to the side of the test set deck.
6. Move the disconnected semirigid cables out of the way and lift the A37 reference mixer switch and
mounting bracket out of the analyzer. It may be necessary to loosen the connector at the other end of
some of the semirigid cables to allow them to be moved enough.
7. Disconnect the wire harness cable (item
③
) from the A37 reference mixer switch.
8. Remove two screws (item
④
) that attach the A37 reference mixer switch to its mounting bracket.
Replacement Procedure
1. Reverse the order of the removal procedure.
When reinstalling the A37 reference mixer switch into the analyzer, loosely install the two mounting
screws (item
➁). Connect the four semirigid cables (item
①
) and torque the connectors to 10 in-lbs,
then tighten the two mounting screws (item
➁).
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.
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