7-46 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A46–A49 Bypass Switches and the A50 Combiner N5242A
Removing and Replacing the A46–A49 Bypass Switches and
the A50 Combiner
Tools Required
• T-10 TORX driver (set to 9 in-lb)
• T-20 TORX driver (set to 21 in-lb)
• 5/16 inch open-end torque wrench (set to 10 in-lb)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-22 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. The bypass switches and the brackets to which they are attached, must be removed as
a complete assembly. The A50 combiner is removed with the A46 bypass switch.
5. Disconnect four semirigid cables (item
①
) from the bypass switch to be removed.
If removing the A46 bypass switch or the A50 combiner, disconnect three semirigid
cables (item
②
) from the A50 combiner.
6. Remove two screws (item
③
) that secure the switch bracket to the test set deck.
7. Move the disconnected semirigid cables out of the way and remove the switch bracket,
with the bypass switch attached, from the analyzer
8. Disconnect the wire harness cable from the bypass switch to be removed.
9. Remove two screws that attach the bypass switch or the A50 combiner to the switch
bracket.
Replacement Procedure
1. Reverse the order of the removal procedure.
Torque all cable connectors to 10 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 7-64.
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