Keysight N5224B, Руководство по обслуживанию

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7-50 Keysight N5224B/25B Service Guide
Repair and Replacement Procedures
Removing and Replacing the A37 Reference Mixer Switch
7-
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 7-24 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-7 .
3. Position the analyzer bottom side up.
4. Disconnect four semirigid cables (item

) from the A37 reference mixer
switch.
5. Remove two screws (item

) 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 other end of the cables to allow them to be
moved. Do not overbend them.
7. Disconnect the wire harness cable (item

) from the A37 reference mixer
switch.
8. Remove two screws (item

) 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

). Connect the four semirigid
cables (item

) and torque the connectors to 10 in-lbs, then tighten the
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 7-78 .
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.