Removing And Replacing The A29-A32 Test Port Couplers - Keysight N5221A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A29–A32 Test Port Couplers
Removing and Replacing the A29–A32 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)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-18 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 assemblies but do not over-bend them.
1. Disconnect the power cord.
2. Remove the front panel assembly. Refer to
page 7-8.
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
6. Disconnect the wire harness (item
the way.
7. Remove the coupler nut (item
8. Move the disconnected semirigid cables out of the way and remove the coupler(s) from the analyzer. On
4-port models, separate the coupler pair.
Replacement Procedure
1. Reverse the order of the removal procedure.
Adhere a new gap pad (4-port) or coupler bumper (2-port) (item
location as on the old one. Replace the vibration mount (item
Hardware and Miscellaneous Parts" on page 6-89
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
7-38
"Removing and Replacing the Front Panel Assembly" on
①
) from each coupler to be removed.
➁
) from the corresponding front panel LED board and place it out of
③
) from each coupler to be removed.
for replacement part numbers.
7-56.
PNA Series Microwave Network Analyzers
④
) to the new coupler in the same
⑤
) if necessary. Refer to
Service Guide N5222-90001
N5221A/22A
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