Technical data

7-28 Service Guide N5230-90025
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A16 Test Set Motherboard and the USB Hub N5230C
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 7-11 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. 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 7-46.
4. If your analyzer is an Option 146 or Option 246, the A29 reference switch (with its mounting bracket), DC
block, and limiter must be removed and reinstalled on the new A16 test set motherboard. Refer to
“Removing and Replacing the A29 Reference Switch, Limiter, and DC Block” on page 7-44.
5. Remove the hard disk drive shield (item
①
) by loosening two attachment screws (item ➁), using a T-10
TORX driver. These screws are accessible through holes in the side of the chassis.
6. Disconnect the ribbon cables (item
③
) from the A16 test set motherboard:
7. Disconnect the wrapped-wire and flexible RF cables (item
④
) from the A16 test set motherboard:
8. With a T-10 TORX driver, remove nine screws (item
⑤
) from the rear panel and four screws (item
⑥
)
from the A16 test set motherboard.
9. 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.
10. 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.
Use the tools specified for all mounting screws.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page 7-58.