Removing And Replacing The A21 Cpu Board Assembly - Keysight N5227A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A21 CPU Board Assembly

Removing and Replacing the A21 CPU Board Assembly
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)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-4 for this procedure.
1. Disconnect the power cord.
2. It is not necessary to remove the instrument cover(s) to remove the A21 CPU board assembly.
3. Remove six screws (item
and two from the ejector handles.
4. Grasp the two ejector handles and rotate them outward toward the sides of the analyzer as shown in the
illustration. This will disengage the A21 CPU board assembly from the A19 midplane board.
5. Slide the A21 CPU board assembly out the rear of the analyzer.
6. If the A21 CPU board assembly is being replaced, you must first remove the A55 solid state drive for
reinstallation in the new A21 CPU board assembly. Refer to
State Drive (SSD)" on page
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
7-18
①
) from the A21 CPU board assembly - four from the CPU assembly rear panel
7-42.
7-54.
PNA Series Microwave Network Analyzers
"Removing and Replacing the A55 Solid
Service Guide N5227-90001
N5227A