86 Keysight E4980A/E4980AL Precision LCR Meter
Replacement Procedure
A1 Mother Board Replacement
6-
A1 Mother Board Replacement
Tools Required
• Torque screwdriver, TORX T20
• Torque screwdriver, TORX T8
• Torque screwdriver, TORX T10
• Box torque wrench, 5/8 inch
Removal Procedure
Refer to Figure 6-8 for this procedure.
Step 1. Remove the 3/4 rack module top as described in “3/4 Rack Module Top
Replacement” on page 73.
Step 2. Remove the PPMC PCA as described in “PPMC PCA Replacement” on
page 84.
Step 3. Disconnect the Mother-Analog cable (item 1) from A1 Mother Board.
Step 4. Disconnect the front USB cable (item 2) from A1 Mother Board.
Step 5. Disconnect the cable power control (item 3) from A1 Mother Board.
Step 6. Disconnect the power supply cables (item 4) from A1 Mother Board.
Step 7. Disconnect the LCD cable (item 5) from Front Panel Assembly.
Step 8. Disconnect the fan cable (item 6) from FAN Assembly.
Step 9. Remove the 5/8 inch nut and washer (item 7) fastening the BNC connector.
Step 10. Remove the five TORX T10 screws (item 8) from the A1 Mother Board.
Step 11. Remove the A1 Mother Board toward front side.
Replacement Procedure
Step 1. Reverse the order of the removal procedure.
Pull out the power supply cables straight without touching the hook on the
cable connector.
When you fasten the BNC connector with the 5/8 inch nut and washer, set
box torque wrench's torque to 17.4 in-lb.
When you fasten the A1 Mother Board with the five TORX T10 screws, set
screwdriver's torque to 8.7 in-lb for left-under screw of item 8 in the Figure
6-8, and set screwdriver's torque to 4.35 in-lb for other screws.
When you connect the LCD Cable to the A1 Mother Board, make sure the
LCD Cable is at the bottom of the Analog Source Cable.
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