7-18 Service Guide N5230-90024
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A14 System Motherboard N5230C
Removing and Replacing the A14 System Motherboard
Tools Required
• T-10 TORX driver (set to 9 in-lb)
• T-20 TORX driver (set to 21 in-lb)
• 5/16 inch open-end torque wrench (set to 10 in-lb)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-7 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 front panel assembly. Refer to “Removing and Replacing the Front Panel Assembly” on
page 7-8.
4. Remove the A4 power supply assembly. Refer to “Removing and Replacing the A4 Power Supply
Assembly” on page 7-14.
5. Remove the card cage boards (A5, A6, A7. A8, A9, and A10) and plenum bracket. Refer to “Removing
and Replacing the A5 through A10 Boards and the Plenum Bracket” on page 7-16.
6. Remove the A15 CPU board. Refer to “Removing and Replacing the A15 CPU Board” on page 7-20.
7. Remove the Midweb. Refer to “Removing and Replacing the Midweb and the B1 Fan(s)” on page 7-48.
8. Remove the ribbon cable clamp (item
⑧
) by removing the attachment screw (item
⑨
). Set the cable
clamp aside for reinstallation later.
9. Disconnect the front panel ribbon cable (item
①
), the USB hub assembly cable (item ➁), and the test
set motherboard ribbon cable (item
③
) from the A14 system motherboard.
10. Remove the remaining three screws (item
④
) that secure the A14 system motherboard.
11. Remove the power switch push button (item
⑤
) and spring (item
⑥
).
12. Slide the A14 system motherboard toward the front of the analyzer to release the hold-down pins (item
⑦
) and lift the motherboard out 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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