7-46 Service Guide E8361-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A25 and A26 Test Port Couplers E8361A
Removing and Replacing the A25 and A26 Test Port
Couplers
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)
• 1-inch open-end torque wrench (set to 72 in-lb)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-21 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 and
Removing the Receiver Deck” on page 7-8 if necessary.
3. Identify the test port coupler to be removed.
4. With a 5/16-inch torque wrench, disconnect the two semirigid cables (item
①) from the
test port coupler.
5. With a 1-inch torque wrench, remove the test port coupler nut (item
②) from the front
panel.
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.
6. Remove the test port coupler from the analyzer. Observe the
CAUTION above.
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 7-66.
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