Lincoln Electric SVM151-A service manual Welding Problems

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F-10					F-10
TROUBLESHOOTING & REPAIR
Observe Safety Guidelines		TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
	WELDING PROBLEMS
The welding output is high with no	1. Check all input and output	1.	Check shunt	feedback	leads
control.	cables for shorts. Check the		R326, 327, R226, 227, plugs
	positive input and output cables		P21 and P6, for loose or faulty
	for “grounded” connections to		connections.	See the	Wiring
	the machine’s case.		Diagram.
		2.	Check the continuity of leads
			401, 301, 201, plugs P20, P22
			and P31. See the Wiring
			Diagram.
		3.	Check the Output Control R1
			and the associated leads. See
			the Wiring Diagram.
		4.	The Weld Control Board may be
			Faulty.
No control of welding output.	1. The panel Output Control is dis-	1.	Check the Output Control (R1)
	abled when a remote control		and the associated leads for
	device is plugged into the 6-pin		loose or faulty connections.
	remote receptacle.	2.	Check all the plug connections
	2. Check the welding cables for		to the Weld Control Board for
	loose or faulty connections.		loose or faulty connections.
			See the Wiring Diagram.
		3.	The Weld Control Board may be
			faulty. Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353.

MULTI-WELD 350