7-20 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A22 GPIB Board N5227A
Removing and Replacing the A22 GPIB Board
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 7-5 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to “Removing the Covers” on page 7-6.
3. Remove the A20 power supply assembly. Refer to “Removing and Replacing the A20 Power Supply
Assembly” on page 7-16.
4. Remove the A21 CPU board assembly. Refer to “Removing and Replacing the A21 CPU Board Assembly”
on page 7-18.
5. Remove the rear panel. Refer to “Removing and Replacing the Rear Panel” on page 7-46.
6. Slide the A22 GPIB board out the rear of 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 7-54.
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