Removing And Replacing The A34-A37 Source Attenuators, The A38-A41 Bias Tees, And The A42-A45 Receiver Attenuators - Keysight Technologies N5221A 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
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 (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
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. Remove the front panel assembly. Refer to
4. Position the analyzer bottom side up.
5. The source and receiver attenuator pair, the associated bias tee, and the
6. Disconnect the ribbon cable (item
7. Disconnect the wire harness cable (item
8. Disconnect two semirigid cables (item
9. Remove three screws (item
10.Move the disconnected semirigid cables out of the way and lift the
Keysight N5221A/22A Service Guide
Figure 7-20 for this procedure.
Front Panel Assembly" on page
bracket to which they are attached, must be removed as a complete
assembly. For some models, especially 2-port models, this may not be
necessary; it may be possible to remove only the bias tee. In this case,
refer to "Removing and Replacing the A38–A41 Bias Tees" on page
removed, from the A19 test set motherboard.
from each bias 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.
test set deck.
attenuator bracket out of the analyzer, with the attenuators and bias tee
attached.
"Removing the Covers" on page
"Removing and Replacing the
7-8.
①
) from the attenuators to be removed.
➁
), for the bias tee to be
③
) from each step attenuator and
④
) that secure the attenuator bracket to the
7-6.
7-48.
7-45