Lincoln Electric SVM100-A service manual Troubleshooting & Repair

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F-11			TROUBLESHOOTING & REPAIR
	TROUBLESHOOTING GUIDE					Observe Safety Guidelines
					detailed in the beginning of this manual.
		PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
		(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
				TIG MODE PROBLEMS
		Lack of penetration in AC TIG		1. Manual balance control set	1.	SCR bridge may be faulty. See
		welding.		improperly - set to negative		Static and Active SCR Tests.
				10 (-10) for maximum	2.	Protection/Snubber board may
				penetration.
						be faulty. See Protection/
						Snubber Board Continuity Test.
					3. Control board may be faulty.-
						Replace.
		Black areas along weld bead.		1. Tungsten electrode may be	This may be a welding procedure
				contaminated. Replace or	problem.
				sharpen.
					Contact The Lincoln Electric
				2. Shielding gas flow may be	Service Department (216) 383-
				insufficient.	2531 or 1-800-833-9353 (WELD).
				3. Contaminated gas or faulty
				gas line or torch.
		Black areas along weld bead at or		1. Increase post flow time.	This may be a welding procedure
		near end of weld.			problem.
					Contact The Lincoln Electric
					Service Department (216) 383-
					2531 or 1-800-833-9353 (WELD).

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 216-383-2531 or 1-800-833-9353.

SQUARE WAVE TIG 255