Removing And Replacing The A38-A41 Source Attenuators And The A46-A49 Receiver Attenuators - Keysight N5224A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators
N5225A
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 Figure 7-20 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 assemblies but do not over-bend them.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Position the analyzer bottom side up.
4. Disconnect the ribbon cable (item
5. Disconnect two semirigid cables (item
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
deck, or remove two screws (item
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
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 Table 7-2 on page
7-42
"Removing the Covers" on page
①
) from each attenuator to be removed.
➁
) from each attenuator to be removed. It may be necessary to
③
) that secure A46 and A49 receiver attenuator brackets to the test set
③
) that secure A47 and A48 receiver attenuator brackets or all
④
) to remove the attenuator to be replaced, from the mounting bracket.
7-56.
PNA Series Microwave Network Analyzers
7-6.
Service Guide N5225-90001
N5224A and