Removing And Replacing The A15 Midplane Board - Keysight Technologies 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
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. Remove the A16 power supply assembly. Refer to
4. Remove the A17 CPU board assembly. Refer to
5. Remove six screws (item
6. Lift the board ejectors (item
7. Note the positions of the five rubber grommets (item
8. Lift the A15 midplane board out of the analyzer.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
Keysight N5221A/22A Service Guide
Figure 7-8 for this procedure.
page 7-6.
Replacing the A16 Power Supply Assembly" on page
the A17 CPU Board Assembly" on page
A15 midplane board from the A14 system motherboard.
three A15 midplane board alignment pins. Remove these rubber
grommets and retain them for reinstallation on the new A15 midplane
board.
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.
that pertain to this removal procedure. Refer to
"Removing the Covers" on
7-25.
①
) from the A15 midplane board.
➁
) to the upright position to disengage the
"Removing and
7-23.
"Removing and Replacing
③
) on the bottom
Table 7-2 on page 7-60.
7-21