Lincoln Electric IM637-A manual Field Service Facility

E-3	TROUBLESHOOTING	E-3
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

The Pro-Cut powers up properly but 1. Press Purge button on the front of
there is no response when the trig-	the Pro-Cut. If air does not flow,
ger is pulled and only the POWER	then:
LED is lit.	a. Auxiliary transformer may be
	faulty.
	b. The main gas solenoid assem-
	bly may be faulty. Check or
	replace.
	c. Possible faulty Output Power
	board.
	d. Possible faulty Control board.

2. (check for continuity from the bulk- head connector to the molex) See Wiring Diagram.

3. Remove the handles (or barrel) of

the torch and examine all the con-

nections. Pay attention to location If all recommended possible areas of of electrode lead mounting at back misadjustment have been checked of torch head, broken trigger and and the problem persists, Contact your local Lincoln Authorized

solenoid leads.

Field Service Facility.

4.Check for proper trigger switch operation. Remove the torch cable assembly from the Pro Cut and test for continuity between 9 and 1 at the quick connect when the trig- ger switch is depressed and no continuity when the switch is not depressed. Replace the trigger switch or torch cable if defective.

5.Possible faulty Control board.

6.Possible faulty Output Power board.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

PRO-CUT 55