7-48 Keysight N5221A/22A Service Guide
Repair and Replacement Procedures
Removing and Replacing the A38–A41 Bias Tees
7-
Removing and Replacing the A38–A41 Bias Tees
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 7-21 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. On some 4-port models, it may be necessary to remove the attenuator
bracket to which the bias tee is attached to facilitate replacing the bias
tee. If this is the case, refer to “Removing and Replacing the A34–A37
Source Attenuators, the A38–A41 Bias Tees, and the A42–A45 Receiver
Attenuators” on page 7-45.
6. Disconnect two semirigid cables (item
①) from the bias tee to be removed.
7. Remove two screws (item
➁) from the bias tee to be removed. Make note
of the location of the wire harness cable ground wire for reinstallation
later.
8. Disconnect the wire harness cable (item
③) from the bias tee.
9. Move the disconnected semirigid cables out of the way and remove the
bias tee from the analyzer. Do not overbend them.
Replacement Procedure
1. Reverse the order of the removal procedure.
Torque all cable connections to 10 in-lbs.
Remember to place the wire harness cable ground lug on the proper
mounting screw.
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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