Removing And Replacing The A18 System Motherboard - Keysight N5224A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A18 System Motherboard

Removing and Replacing the A18 System Motherboard
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)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• 5/8 inch nutsetter (torque to 21 in-lb or 2.38 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 6-6 on page 6-18
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. Remove the front panel assembly. Refer to
4. Remove the A20 power supply. Refer to
5. Remove the A21 CPU. Refer to
6. Disconnect the rear panel cables.
7. Remove the threaded hardware from the rear panel.
8. Remove the rear panel.
9. Remove the A22 GPIB board. Refer to
10. Remove the A19 midplane board. Refer to
11. Remove the A4–A17 boards. Refer to
12. Remove the right side and left side fan brackets. Disconnect the right fan wire and the left fan wire from the A18
System Motherboard, and then remove the fan brackets. Refer to
7-52.
13. Turn the analyzer over so that the bottom side is up and remove the A23 Test Set Motherboard and the A24 IF Mux.
Disconnect the two ribbon cables from the A18 System Motherboard.
14. Remove four screws (item
15. Remove seven screws (item
16. Turn the analyzer back over so that the top side is up. Remove two screws (item
midplane bracket to the chassis inner panels. Lift the midplane bracket out of the analyzer.
17. Remove the three screws (item
18. Remove three screws (item
19. Slide the A18 system motherboard toward the rear of the analyzer to release it from the 15 keyhole standoffs (item
⑥
) on the chassis.
Lift the A18 system motherboard out of the analyzer.
20.
Replacement Procedure
Reverse the order of the removal procedure.
1.
Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal procedure.
2.
Refer to
Table 7-2 on page 7-56
7-16
and Figure 6-21 on page 6-49
"Removing the Covers" on page
"Removing and Replacing the Front Panel Assembly" on page
"Removing and Replacing the A20 Power Supply Assembly" on page
"Removing and Replacing the A21 CPU Board Assembly" on page
"Removing and Replacing the A22 GPIB Board" on page
"Removing and Replacing the A19 Midplane Board" on page
"Removing and Replacing the A4–A17 Boards" on page
①
) that secure the bottom of the midplane bracket to the chassis.
➁
) that secure the left side inner bracket to the chassis.
④
) that secure the front bracket to the chassis left inner panel.
⑤
) that secure the A18 system motherboard to the chassis.
.
PNA Series Microwave Network Analyzers
for this procedure.
7-6.
"Removing and Replacing the Fans" on page
③
) from each side that secure the
N5224A and N5225A
7-8.
7-20.
7-22.
7-24.
7-18.
7-14.
Service Guide N5225-90001