7-36 Service Guide N5230-90024
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A21 and A22 Test Port Couplers N5230C
Removing and Replacing the A21 and A22 Test Port Couplers
(For Option 220 analyzers with serial numbers prefixed MY4640 and above.)
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 7-15 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.
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
➁) 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 them.
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 7-54.
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