Keysight Technologies N5221A, Руководство по обслуживанию

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Keysight N5221A/22A Service Guide 7-43
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.
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 A33 reference mixer
switch.
5. Remove three screws (item
➁
) that secure the A33 reference mixer switch
to the side of the test set 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
③
) from the A33 reference mixer
switch.
8. Remove four screws (item
④
) that attach the A33 reference mixer switch
to its mounting bracket.
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 screws (item
➁
). Connect the four semirigid
cables (item
①
) and torque the connectors to 10 in-lbs, 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 7-60 .
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.