Keysight Technologies N5221A

7-54 Keysight N5221A/22A Service Guide
Repair and Replacement Procedures
Removing and Replacing the Front Panel LED Boards
7-
Removing and Replacing the Front Panel LED Boards
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)
— 1 inch open-end torque wrench (torque to 72 in-lb or 8.15 N.m)
— ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-18 for this procedure.
1. Disconnect the power cord.
2. Remove the test port couplers. Refer to “Removing and Replacing the
A29–A32 Test Port Couplers” on page 7-41.
3. Remove two screws (item
①) from the LED board to be removed and
remove the LED board from the analyzer.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
that pertain to this removal procedure. Refer to Table 7-2 on page 7-60.
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.