Lincoln Electric SVM170-A service manual Wire Feeding Problems

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

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POWER MIG 255C

4. If the drive rolls are NOT turning when the gun trigger is pulled then contact your local Lincoln Electric Authorized Field Service Facility.

3. The control board may be faulty. Replace.

3. The gun liner may be clogged. Check or replace.

2. The Wire Feed Control poten- tiometer may be faulty. Check or replace. See Wiring Diagram.

2. If the drive rolls are turning then check for a mechanical restric- tion in the wire feed path.

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F-8	TROUBLESHOOTING AND REPAIR					F-8
	Observe all Safety Guidelines detailed throughout this manual.
PROBLEMS		POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)		COURSE OF ACTION
		WIRE FEEDING PROBLEMS
No control of wire feed speed. Other		1.	The wire feed speed control	1.	The Wire Speed Control poten-
machine functions are normal			may be dirty. Rotate several		tiometer may be faulty. Check or
			times and check if problem is		replace. See Wiring Diagram.
			resolved.
				2.	Perform the Wire Drive Motor
					and Tachometer	Feedback
					Test.
				3.	The control board may be faulty.
					Replace.
There is no wire feed when gun trig-		1.	Check for adequate wire supply.	1.	Perform the Wire Drive Motor
ger is pulled. Normal open circuit					and Tachometer	Feedback
voltage is present.					Test.