Keysight N5221A/22A Service Guide 7-45
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 Figure 7-20 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6.
3. Remove the front panel assembly. Refer to “Removing and Replacing the
Front Panel Assembly” on page 7-8.
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. 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 7-48.
6. Disconnect the ribbon cable (item
①) from the attenuators to be removed.
7. Disconnect the wire harness cable (item
➁), for the bias tee to be
removed, from the A19 test set motherboard.
8. Disconnect two semirigid cables (item
③) from each step attenuator and
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.
9. Remove three screws (item ④) that secure the attenuator bracket to the
test set deck.
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.
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.
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