Removing And Replacing The A25 Hma26.5 - Keysight N5227A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A25 HMA26.5

Removing and Replacing the A25 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 7-7 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
3. Position the analyzer bottom side up.
4. Disconnect the ribbon cable (item
5. Disconnect cable W61 from the A25 HMA26.5.
6. Remove cable W62 from between the A25 HMA26.5 and the A26 splitter.
7. 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
7-26
"Removing the Covers" on page
①
) from the A25 HMA26.5 assembly.
➁
) that hold the A25 HMA26.5 on the chassis side panel.
7-54.
PNA Series Microwave Network Analyzers
7-6.
Service Guide N5227-90001
N5227A