Removing And Replacing The A21 Hma26.5 - Keysight N5221A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A21 HMA26.5

Removing and Replacing the A21 HMA26.5
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)
• 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 assemblies but do not over-bend them.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Position the analyzer bottom side up.
4. Disconnect the ribbon cable (item
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
8. Remove the mounting bracket, with the A21 HMA26.5 attached, from the analyzer.
9. Remove four screws (item
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
7-30
"Removing the Covers" on page
①
) from the A21 HMA26.5 assembly.
➁
) from the A21 HMA26.5 mounting bracket.
③
) that attach the A21 HMA26.5 to the mounting bracket.
7-56.
PNA Series Microwave Network Analyzers
7-6.
Service Guide N5222-90001
N5221A/22A