7-22 Service Guide N5242-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A17 CPU Board Assembly N5242A
Removing and Replacing the A17 CPU Board Assembly
Tools Required
• T-10 TORX driver (set to 9 in-lb)
• T-20 TORX driver (set to 21 in-lb)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-10 for this procedure.
1. Disconnect the power cord.
2. It is not necessary to remove the instrument cover(s) to remove the A17 CPU board
assembly.
3. Remove six screws (item
①
) from the A17 CPU board assembly; four from the CPU
assembly rear panel 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 A17 CPU board assembly from the
A15 midplane board.
5. Slide the A17 CPU board assembly out the rear of the analyzer.
6. If the A17 CPU board assembly is being replaced, you must first remove the A51 hard
disk drive for reinstallation in the new A17 CPU board assembly. Refer to “Removing
and Replacing the A51 Hard Disk Drive (HDD)” on page 7-48.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. If a new Certificate of Authenticity (license) label is supplied with your new A17 CPU
board assembly, adhere it to the outer cover in the location specified in Figure 7-1 on
page 7-7.
3. Perform the post-repair adjustments, verifications, and performance tests that pertain
to this removal procedure. Refer to Table 7-2 on page 7-64.
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