7-72 Service Guide E8364-90038
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A45 and A46 Reference Channel Transfer Switches (Option 081) E8362C, E8363C, E8364C
Removing and Replacing the A45 and A46 Reference Channel Transfer
Switches (Option 081)
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 7-26 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6. Position the analyzer bottom side
up and raise the receiver deck as shown. Refer to “Raising the Receiver Deck” on page 7-8 if necessary.
3. Identify the switch assembly to be removed. If removing A45, go to step 4. If removing A46, perform the
following steps first.
a. Remove the A43 receiver step attenuator, if present. Refer to “Removing and Replacing the A43 and
A44 35-dB Receiver Step Attenuators (Option 016)” on page 7-70.
b. Remove the A25 test port coupler. Refer to “Removing and Replacing the A25 and A26 Test Port
Couplers” on page 7-50.
4. Disconnect the stranded control cable (item ①) by pressing the release button in the center of the
connector.
5. With a 5/16-inch torque wrench, disconnect the three semirigid cables (item
➁) from the A45 or A46
reference channel switch.
6. With a T-10 TORX driver, remove the four mounting screws (item
③) holding A46 or the two mounting
screws (item
④) holding the A45 mounting bracket.
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing of the cables
is necessary to remove the assembly. Do not over-bend the semirigid cables.
7. Remove A45 or A46 from the analyzer. Observe the
CAUTION above.
8. With a T-10 TORX driver, remove the four mounting screws (item
③) holding A45 to the bracket.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page 7-82.
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