Lincoln Electric SVM 117-A service manual Perform the Wire Drive Motor

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F-7	TROUBLESHOOTING & REPAIR										F-7
	TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS	POSSIBLE AREAS OF							RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENTS(S)							COURSE OF ACTION
		WIRE FEEDING PROBLEMS
No control of wire feed speed.		1. The	wire	feed	speed	control	1.	The Wire Speed Control poten-
Other machine functions are nor-		may	be dirty.		Rotate	several		tiometer may be faulty.			Check
mal.		times and check if problem is						or	replace.	See	Wiring
		resolved.						Diagram.
							2.	Perform the Wire Drive Motor
								and Tach Feedback test.
							3.	The control board may be faulty.
								Replace.
		1. If the drive rolls are turning then
There is no wire feed when gun trig-		check for a mechanical restric-					1.	Perform the Wire Drive Motor
ger is pulled. Normal open circuit		tion in the wire feed path.						and Tach Feedback Test.
voltage is present.
		2. The gun liner may be clogged.					2. The Wire Feed Control poten-
		Check or Replace.						tiometer may be faulty.			Check
								or	replace.	See	Wiring
		3. If the drive rolls are NOT turning						Diagram.
		when the gun trigger is pulled
		then contact your local Lincoln					3. The control board may be faulty.
		Electric		Authorized		Field		Replace.
		Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216- 383-2531 or 1-800-833-9353

WIRE-MATIC 250