Keysight N5224B, Руководство по обслуживанию

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7-38 Keysight N5224B/25B Service Guide
Repair and Replacement Procedures
Removing and Replacing the A25 HMA26.5
7-
Removing and Replacing the A25 HMA26.5
1
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 7-18 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-7 .
3. Position the analyzer bottom side up.
4. Disconnect the ribbon cable (item

) from the A25 HMA26.5 assembly.
5. Disconnect semirigid cables (item

) from the A25 HMA26.5. It may be
necessary to loosen the other end of the cables to allow them to be
moved. Do not over-bend them.
6. Remove four screws (item

) that hold the A25 HMA26.5 to the chassis
side panel.
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 7-78 .
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 Figure 7-19 on page 40 and for details on
A26 splitter and cabling, refer to your option-model in Chapter 6 “2-Port Configurations, Serial Number Pre-
fix <6021” on page 31 and “4-Port Configuration, Serial Number Prefix <6021” on page 137 .
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.