Keysight N5227B Service Guide 7-19
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
1.
Disconnect the power cord.
2.
Remove the outer and inner covers. Refer to
.
3.
Remove the front panel assembly. Refer to
Front Panel Assembly” on page 7-7
.
4.
Remove the A20 power supply. Refer to
“Removing and Replacing the A20
Power Supply Assembly” on page 7-24
.
5.
“Removing and Replacing the A21 CPU
.
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
“Removing and Replacing the A22
10.
Remove the A19 midplane board. Refer to
A19 Midplane Board” on page 7-22
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
“Removing and Replacing the Fans” on
.
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.
Refer to
for steps 14 and 15.
1.
Remove four screws (item A) that secure the bottom of the midplane
bracket to the chassis.
