Lincoln Electric SVM140-A service manual Perform the Input Filter Capacitor Discharge Procedure

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F-40 F-40

TROUBLESHOOTING & REPAIR

TRIGGER CIRCUIT TEST (continued)

9.With the torch trigger activated check the voltage at plug J32 pin-3 (lead#344) (posi- tive) to plug J32 pin-14 (lead#312) (nega- tive). Normal is less than 1 VDC. If more than 1 VDC is indicated, the power output board may be faulty. Release (deactivate) the torch trigger and remove input power to the Pro-Cut 55.

10.Perform the Input Filter Capacitor

Discharge Procedure.

11.Check the continuity of leads #344 and #312 between the output board and the control board. See Figure F.9, the Simplified Trigger Circuit Diagram, and Figure F.10.

12.If all of the above checks are OK, the con- trol board may be faulty. Replace.

PRO-CUT 55