7-30 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A21 HMA26.5 N5242A
Removing and Replacing the A21 HMA26.5
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)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-14 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 outer cover. Refer to “Removing the Covers” on page 7-6.
3. Position the analyzer bottom side up.
4. Disconnect the ribbon cable (item
①
) from the A21 HMA26.5 assembly.
5. Disconnect cable W41 from the A21 HMA26.5.
6. Remove cable W42 from between the A21 HMA26.5 and the A22 splitter.
7. Remove two screws (item
②
) from the A21 HMA26.5 mounting bracket.
8. Remove the mounting bracket, with the A21 HMA26.5 attached, from the analyzer.
9. Remove four screws (item
③
) that attach the A21 HMA26.5 to the mounting bracket.
Replacement Procedure
1. Reverse the order of the removal procedure.
Torque all RF cable connectors to 10 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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