Removing And Replacing The A34-A37 Source Attenuators, The A38-A41 Bias Tees, And The A42-A45 Receiver Attenuators - Agilent Technologies N5242A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A34–A37 Source Attenuators, the A38–A41 Bias Tees, and the A42–A45 Receiver Attenuators
N5241A/42A
Removing and Replacing the A34–A37 Source Attenuators,
the A38–A41 Bias Tees, and the A42–A45 Receiver Attenuators
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 7-20
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing
of the cables is necessary, but do not over-bend the semirigid cables.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Remove the front panel assembly. Refer to
Assembly" on page
4. Position the analyzer bottom side up.
5. The source and receiver attenuator pair, the associated bias tee, and the bracket to
which they are attached, must be removed as a complete assembly.
6. Disconnect the ribbon cable (item
7. Disconnect the wire harness cable (item
A19 test set motherboard.
8. Disconnect two semirigid cables (item
tee 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.
9. Remove three screws (item
10. Move the disconnected semirigid cables out of the way and lift the attenuator bracket
out of the analyzer, with the attenuators and bias tee attached.
11. Remove two screws (item
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
7-42
for this procedure.
"Removing the Covers" on page
7-8.
①
) from the attenuators to be removed.
③
④
) that secure the attenuator bracket to the test set deck.
⑤
) to remove the attenuator or bias tee to be replaced, from
Table 7-2 on page
PNA Series Microwave Network Analyzers
"Removing and Replacing the Front Panel
②
), for the bias tee to be removed, from the
) from each step attenuator and from each bias
7-68.
7-6.
Service Guide N5242-90001