7-22 Service Guide N5230-90014
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A16 Test Set Motherboard and the USB Hub N5230A
Removing and Replacing the A16 Test Set Motherboard
and the USB Hub
Tools Required
• T-8 TORX driver (set to 5 in-lb)
• 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 7-9 for this procedure.
1. Disconnect the power cord.
2. Remove the outer covers. Refer to “Removing the Covers” on page 7-6. Position the
analyzer bottom side up.
3. Remove the A41 hard disk drive. Refer to “Removing and Replacing the A41 Hard Disk
Drive (HDD)” on page 7-34.
4. Remove the hard disk drive shield (item
①
) by loosening two attachment screws
(item
②
), using a T-10 TORX driver. These screws are accessible through holes in the
side of the chassis.
5. Disconnect the ribbon cables (item
③
) from the A16 test set motherboard.
6. Disconnect the wrapped-wire and flexible RF cables (item
④
) from the A16 test set
motherboard.
7. With a T-10 TORX driver, remove the following screws:
• Nine screws (item
⑤
) from the rear panel.
• Four screws (item
⑥
) from the A16 test set motherboard.
8. Slide the A16 test set motherboard toward the front of the instrument to release the
locking pins (item
⑦
), then lift the motherboard and remove it from the analyzer.
9. To remove the USB hub, remove two screws (item
⑧
), using a T-8 TORX driver.
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 7-45.
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