Removing And Replacing The A14 System Motherboard - Agilent Technologies N5242A 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 (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
3. Remove the front panel assembly. Refer to
Assembly" on page
4. Remove the A18 GPIB board. Refer to
on page 7-24.
5. Remove the A15 midplane board. Refer to
Board" on page 7-18.
6. Remove the A4–A13 boards. Refer to
page 7-14.
7. Remove the fan bracket and fans. Refer to
7-62.
8. Turn the analyzer over so that the bottom side is up and remove four screws (item
that secure the 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
that secure the left side bracket to the chassis left inner panel.
10. Remove two screws (item
chassis left and 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 standoffs (item
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
7-16
7-8.
"Removing and Replacing the A18 GPIB Board"
"Removing and Replacing the A4–A13 Boards" on
③
) from each side that secure the midplane bracket to the
④
) that secure the A14 system motherboard to the chassis.
⑤
) on the chassis.
Table 7-2 on page
PNA Series Microwave Network Analyzers
"Removing the Covers" on page
"Removing and Replacing the Front Panel
"Removing and Replacing the A15 Midplane
"Removing and Replacing the Fans" on page
7-68.
Service Guide N5242-90001
N5241A/42A
7-6.
①
),
②
)