Removing And Replacing The A21 Hma26.5 - Keysight N5264A 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 (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
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 measurement receiver bottom side up.
4. Disconnect the ribbon cable (item
5. Disconnect cable W41 from the A21 HMA26.5.
6. Disconnect cable W47 at the A21 HMA26.5.
7. Remove two screws (item
8. Remove the mounting bracket, with the A21 HMA26.5 attached, from the
9. Remove four screws (item
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
7-32
Figure 7-15
for this procedure.
measurement receiver.
mounting bracket.
Torque all RF cable connectors to 10 in-lbs.
that pertain to this removal procedure. Refer to
"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
Table 7-2 on page
Keysight N5264A Service Guide
7-5.
7-42.