Keysight E4980A/E4980AL Precision LCR Meter 79
Replacement Procedure
A2 Analog Board Replacement
A2 Analog Board Replacement
Tools Required
• Torque screwdriver, TORX T10
• Torque screwdriver, TORX T20
• Box torque wrench, 7 mm
• Box torque wrench, 5/8 inch
Removal Procedure
Refer to Figure 6-5 and 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 A3 Analog Daughter Board as described in “A3 Analog Daughter
Board Replacement” on page 77.
Step 3. Disconnect the Mother-Analog Cable (item 1) from the A2 Analog Board.
Step 4. Disconnect the Analog Source Cable (item 2) from the A2 Analog Board.
Step 5. Remove the four 7 mm Standoff (item 3) from the A2 Analog Board.
Step 6. Remove the TORX T20 screw (item 4) from the PCA E4980 USB. Then,
Disconnect the ground cable from the PCA E4980 USB.
Step 7. Lift the A2 Analog Board and front panel toward upside.
Step 8. Remove the five 5/8 inch nuts and washers (item 5) fastening the BNC
connector.
Step 9. Remove the A2 Analog Board from Front Panel.
Step 10. Disconnect the two SMB cables (item 6) from the A2 Analog Board.
Replacement Procedure
Step 1. Reverse the order of the removal procedure.
When you fasten the A2 Analog Board with the five 5/8 inch nuts and
washers, set box torque wrench's torque to 17.4 in-lb.
When you fasten the A2 Analog Board with the four 7 mm Standoff, set
box torque wrench's torque to 8.7 in-lb.
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