Keysight Technologies N5244/5B Service Manual page 567

Repair and Replacement Procedures
Removing and Replacing the A18 System Motherboard
Removing and Replacing the A18 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)
— 5/8 inch nutsetter (set to 21 in-lb)
— ESD grounding wrist strap
Be careful not to damage the center pins of the semirigid cables. Some
flexing of the cables is necessary to remove assemblies but do not
over-bend them.
Any cables that are removed should be labeled for reinstallation later.
Removal Procedure
Refer to
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. Remove the front panel assembly. Refer to
4. Remove the A20 power supply. Refer to
5. Remove the A21 CPU. Refer to
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
10. Remove the A19 midplane board. Refer to
11.Remove the A4–A17 boards. Refer to
12. Remove the right side and left side fan brackets. Disconnect the right fan
Keysight N5244B/45B Service Guide
Figure 7-12 for this procedure.
page 7-8.
Front Panel Assembly" on page
Power Supply Assembly" on page
Board Assembly" on page
GPIB Board" on page 7-36.
A19 Midplane Board" on page
A4–A17 Boards (For analyzers with serial numbers prefixed
MY/SG/US5150 and below)" on page
wire and the left fan wire from the A18 System Motherboard, and then
remove the fan brackets. Refer to
page 7-89.
"Removing the Covers" on
"Removing and Replacing the
7-10.
"Removing and Replacing the A20
7-32.
"Removing and Replacing the A21 CPU
7-34.
"Removing and Replacing the A22
"Removing and Replacing the
7-30.
"Removing and Replacing the
7-20.
"Removing and Replacing the Fans" on
7-27