Lincoln Electric SVM168-B service manual Troubleshooting Guide

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F-8	TROUBLESHOOTING & REPAIR				F-8
Observe Safety Guidelines			TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		OUTPUT PROBLEMS
No DC welding output. AC welding		1. Make sure the Polarity Switch is	1. Perform the Output Bridge Test.
output and auxiliary power is nor-		in the proper position and is	2.	Check the Choke (L1),	the
mal.		“seated” correctly.
				Polarity Switch (S2) and associ-
		2. Make sure the electrode and		ated wires for loose or faulty
		polarity are correct for the		connections. Check the choke
		process being used.		winding for continuity and test
				to be sure it is NOT grounded
				the choke iron.
No AC welding output. DC welding		1. Make sure the Polarity Switch is	1. Check the operation of the
output and auxiliary power is nor-		in the proper position and is		Polarity Switch (S2). Also check
mal.		“seated” correctly.		the associated wires for loose
		2. Make sure the electrode is cor-		or faulty connections.	See
				Wiring Diagram.
		rect for the process being used.
		3. Make sure the welding cables	2.	Check for continuity from lead
				“S2” to lead “E” located in the
		are not coiled or too long.
				main stator. See Wiring Dia-
				gram.

CAUTION

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

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