Agilent Technologies N5241A, Service Manual

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7-34 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A23 and A24 Mixer Bricks N5241A/42A
Removing and Replacing the A23 and A24 Mixer Bricks
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 Figure 7-16 for this procedure.
CAUTION 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 “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
②
) 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.