7-38 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A29–A32 Test Port Couplers N5242A
Removing and Replacing the A29–A32 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 7-18 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 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 7-8.
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
①
) from each coupler to be removed.
6. Disconnect the wire harness (item
②
) from the corresponding front panel LED board
and place it out of the way.
7. Remove the coupler nut (item
③
) from each coupler to be removed.
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
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, All Options Except 029” on page
6-72 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 7-64.
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