Keysight Technologies N5244/5B Service Manual page 583

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 W51 from the A25 HMA26.5.
6. Remove cable W52 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
1. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and
N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which
HMA26.5 assembly your PNA has installed, refer to Chapter 7 and
on A26 splitter and cabling, refer to your option-model in Chapter 6
Prefixes <6021" on page 6-34
Keysight N5244B/45B Service Guide
Figure 7-19 for this procedure.
side panel.
Torque all RF cable connectors to 10 in-lbs.
that pertain to this removal procedure. Refer to
and "4-Port Configuration, Serial Number Prefix <6021" on page
1
"Removing the Covers" on page

) from the A25 HMA26.5 assembly.

) that hold the A25 HMA26.5 on the chassis
Table 7-2 on page
Figure 7-20 on page 7-45
"2-Port Configurations, Serial Number
7-8.
1 .
7-93.
and for details
6-129.
7-43