Keysight Technologies N5244/5B Service Manual page 588

Repair and Replacement Procedures
Removing and Replacing the A27 and A28 Mixer Bricks
Removing and Replacing the A27 and A28 Mixer Bricks
Tools Required
— T-8 TORX driver (set to 6 in-lb)
— 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. Remove the A26 splitter.
5. Disconnect all semirigid cables (item
6. Disconnect the ribbon cables (item
7. Remove two screws (item
8. Move the disconnected semirigid cables out of the way and lift the mixer
9. If replacing a mixer brick:
7-48
Figure 7-22 for this procedure.
Splitter" on page 7-46.
brick mounting block out of the analyzer just enough to allow the gray
flexible RF cables (item
loosen the connector at the other end of some of the semirigid cables to
allow them to be moved enough.
Note the locations of each of the gray flexible cables for reconnection
later. Disconnect these cables and remove the mixer brick mounting block
with the mixer brick(s) and the mixer brick shields from the analyzer.
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 7-20 on page 7-45
cabling, refer to your option-model in Chapter 6
Number Prefixes <6021" on page 6-34
Prefix <6021" on page
"Removing the Covers" on page
1
Refer to "Removing and Replacing the A26

) from each of the mixer bricks.

) from each of the mixer bricks.

) from each end of the mixer brick bracket.

) to be disconnected. It may be necessary to
and for details on A26 splitter and
"2-Port Configurations, Serial
and "4-Port Configuration, Serial Number
6-129.
Keysight N5244B/45B Service Guide
7-8.