Removing And Replacing The A14 System Motherboard - Keysight N5221A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A14 System Motherboard

Removing and Replacing the A14 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 2.38N.m)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• 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
3. Remove the front panel assembly. Refer to
page 7-8.
4. Remove the A18 GPIB board. Refer to
5. Remove the A15 midplane board. Refer to
7-18.
6. Remove the A4–A13 boards. Refer to
7. Remove the fan bracket and fans. Refer to
8. Turn the analyzer over so that the bottom side is up and remove four screws (item
bottom of the midplane bracket to the chassis.
9. Turn the analyzer back over so that the top side is up. Remove seven screws (item
left side bracket to the chassis left inner panel.
10. Remove two screws (item
right inner panels. Lift the midplane bracket out of the analyzer.
11. Remove three screws (item
12. Slide the A14 system motherboard toward the rear of the analyzer to release it from the 15 keyhole
⑤
standoffs (item ) on the chassis.
13. Lift the A14 system motherboard just enough to unplug the ribbon cable from the bottom side, then lift it
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
7-16
"Removing the Covers" on page
"Removing and Replacing the Front Panel Assembly" on
"Removing and Replacing the A18 GPIB Board" on page
"Removing and Replacing the A15 Midplane Board" on page
"Removing and Replacing the A4–A13 Boards" on page
"Removing and Replacing the Fans" on page
③
) from each side that secure the midplane bracket to the chassis left and
④
) that secure the A14 system motherboard to the chassis.
7-56.
PNA Series Microwave Network Analyzers
7-6.
7-52.
①
), that secure the
➁
) that secure the
Service Guide N5222-90001
N5221A/22A
7-24.
7-14.