Troubleshooting & repair, Trigger circuit test (continued) – Lincoln Electric PRO-CUT 55 SVM140-A User Manual
Page 77
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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
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.
TROUBLESHOOTING & REPAIR
F-40
F-40
PRO-CUT 55
TRIGGER CIRCUIT TEST (continued)
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