7-34 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A33–A36 Test Port Couplers N5227A
Removing and Replacing the A33–A36 Test Port Couplers
Tools Required
• T-10 TORX driver (torque to 9 in-lb or 1.02 N.m)
• T-20 TORX driver (torque to 21 in-lb or 2.38 N.m)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• 1 inch open-end torque wrench (torque to 72 in-lb or 8.15 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-12 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 front panel assembly. Refer to “Removing and Replacing the Front Panel Assembly” on
page 7-7.
3. Position the analyzer bottom side up.
4. On 4-port models, it is necessary to remove the couplers in pairs: ports 1/3 and 2/4.
5. Disconnect two semirigid cables (item
①
) from each coupler to be removed.
6. Remove the coupler nut (item
③
) from each coupler to be removed.
7. Move the disconnected semirigid cables out of the way and remove the coupler(s) from the analyzer. It
may be necessary to loosen the connector at the other end of some of the semirigid cables to allow
them to be moved enough.
Replacement Procedure
1. Reverse the order of the removal procedure.
Adhere a new gap pad (4-port) or coupler bumper (2-port) (item
④
) to the new coupler in the same
location as on the old one. Replace the vibration mount (item
⑤
) if necessary. Refer to “Bottom
Hardware and Miscellaneous Parts” on page 6-76 for replacement part numbers.
Torque all connectors to 10 in-lbs. Torque coupler nuts to 72 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 7-54.
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