Removing And Replacing The A25 Hma26.5 - Keysight Technologies N5247B 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 (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 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.
2. Perform the post-repair adjustments, verifications, and performance tests
7-36
Figure 7-16 and
side panel.
Torque all RF cable connectors to 10 in-lbs.
that pertain to this removal procedure. Refer to
1. The A26 splitter (5067-4086) and N5247-20111, N5245-20022, N5245-20023, and
N5247-20110 cables are only used with a legacy HMA26.5 p/n: 5087-7765. The N5240-20125,
N5247-20184 and N5247-20185 cables are used only with the new N5240-60101 HMA-26.5. If
you are unclear which HMA26.5 assembly your PNA has installed, refer to Chapter 7
Repairs and Figure 7-17 on page 38
refer to your option-model in Chapter 6
fixes <6021" on page 6-31
<6021" on page 6-84.
Figure 7-17 for this procedure.
"Removing the Covers" on page

) from the A25 HMA26.5 assembly.

) that hold the A25 HMA26.5 on the chassis
and for details on A26 splitter and cabling,
"2-Port Configurations, Serial Number Pre-
and "4-Port Configuration, Serial Number Prefixes
Keysight N5247B Service Guide
7-6.
Table 7-2 on page 7-92.
1
.