Removing And Replacing The A15 Midplane Board - Keysight N5221A Service Manual

Repair and Replacement Procedures

Removing and Replacing the A15 Midplane Board

Removing and Replacing the A15 Midplane Board
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)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-8 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. Remove the A16 power supply assembly. Refer to
Assembly" on page 7-20.
4. Remove the A17 CPU board assembly. Refer to
on page 7-22.
5. Remove six screws (item
6. Lift the board ejectors (item
A14 system motherboard.
7. Note the positions of the five rubber grommets (item
alignment pins. Remove these rubber grommets and retain them for reinstallation on the new A15
midplane board.
8. Lift the A15 midplane board out of the analyzer.
Replacement Procedure
1. Reverse the order of the removal procedure.
Be careful to align the guide pins on the A15 midplane board connectors with the slots on the A14
system motherboard connectors.
The board ejectors should be in the upright position when installing the A15 midplane board. Align these
ejectors with the slots in the chassis inner panels as the board is lowered into position and then push
them down flat.
Remember to install the five rubber grommets on the bottom three alignment pins: one on the alignment
pin closest to the fans and two each on the other two alignment pins.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page
7-18
"Removing the Covers" on page
"Removing and Replacing the A16 Power Supply
"Removing and Replacing the A17 CPU Board Assembly"
①
) from the A15 midplane board.
➁
) to the upright position to disengage the A15 midplane board from the
7-56.
PNA Series Microwave Network Analyzers
7-6.
③
) on the bottom three A15 midplane board
Service Guide N5222-90001
N5221A/22A