Keysight N5221A/22A Service Guide 7-37
Repair and Replacement Procedures
Removing and Replacing the A23 and A24 Mixer Bricks
Removing and Replacing the A23 and A24 Mixer Bricks
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 1.13 in-lb)
— ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-16 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6.
3. Position the analyzer bottom side up.
4. Remove cable W42 from between the A21 HMA26.5 and the A22 splitter.
5. Disconnect all semirigid cables (item
①) from each of the mixer bricks.
6. Disconnect the ribbon cables (item
➁) from each of the mixer bricks.
7. Remove two screws (item
③) from each end of the mixer brick bracket.
8. Move the disconnected semirigid cables out of the way and lift the mixer
brick mounting block out of the analyzer just enough to allow the gray
flexible RF cables (item
④) to be disconnected. It may be necessary to
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 A22 splitter attached, from the analyzer.
9. If the A23 mixer brick is to be replaced, disconnect cable W43 from the
A23 mixer brick.
If the A24 mixer brick is to be replaced, disconnect cable W44 and remove
the short circuit termination (item
⑤) from the A24 mixer brick. Retain the
short circuit termination for installation on the new mixer brick.
10.Remove three screws that attach the mixer brick to be replaced to the
mixer brick mounting block, and remove the mixer brick from the
mounting block.
Replacement Procedure
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.
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