Keysight N5224A/25A Service Guide 7-45
Repair and Replacement Procedures
Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver
Attenuators
Removing and Replacing the A38–A41 Source Attenuators and the
A46–A49 Receiver Attenuators
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
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.
Disconnect the ribbon cable (item
①
) from each attenuator to be removed.
5.
Disconnect two semirigid cables (item
➁
) from each attenuator to be
removed. It may be necessary to remove additional cables to remove the
attenuator bracket. If so, note the location and orientation of each for
reinstallation later.
6.
Remove three screws (item
③
) that secure A46 and A49 receiver
attenuator brackets to the test set deck, or remove two screws (item
③
)
that secure A47 and A48 receiver attenuator brackets or all source
attenuator brackets to the test set deck.
7.
Move the disconnected semirigid cables out of the way and lift the
attenuator bracket out of the analyzer, with the attenuator attached. It
may be necessary to loosen the other end of the cables to allow them to
be moved. Do not overbend them.
8.
Remove two screws (item
④
) to remove the attenuator to be replaced,
from the mounting bracket.
Replacement Procedure
1.
Reverse the order of the removal procedure.
Torque all cable connections to 10 in-lbs.
2.
Perform the post-repair adjustments, verifications, and performance tests
that pertain to this 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 assemblies but do not
over-bend them.
