7-28 Service Guide N5230-90014
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A21 and A22 Test Port Couplers and Coupler Mounting Brackets N5230A
Removing and Replacing the A21 and A22 Test Port
Couplers and Coupler Mounting Brackets
Tools Required
• T-10 TORX driver (set to 9 in-lb)
• T-15 TORX driver (set to 14 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 7-12 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 wrench, disconnect the semirigid cables (item
①
) from the test port
coupler.
5. With a T-15 TORX driver, remove the mounting screws (item
②
) from the test port
coupler.
6. With a 1 inch wrench, remove the test port coupler dress nut (item
③
) from the front
panel. Be careful not to scratch 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.
7. Remove the test port coupler from the analyzer. Observe the
CAUTION above.
8. The test port coupler mounting block can now be removed by removing the attachment
screws (item
④
). It is not necessary to remove the mounting block to replace the coupler.
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 7-45.
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