Lincoln Electric SVM141-A service manual To Technical Specifications

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F-13			F-13
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 WELDING PROBLEMS
The high frequency “spark” is pre-	1.	The torch may be faulty. Check	1. Check spark gap adjustment.
sent at the tungsten electrode, but		or replace.	See the Maintenance section.
the operator is unable to establish	2.	The current control may be set	2. This may be a welding proce-
a welding arc. The machine has
		too low.	dure problem.
normal open circuit voltage. Refer
to Technical Specifications in the	3.	The tungsten electrode may be	Contact the Lincoln Service
Installation section.		contaminated. Replace or	Department (216) 383-2531 or
		sharpen.	1-800-833-9353 (WELD).
	4.	The electrode may be too large
		for the process.
	5.	If a helium blend is being used
		as a shielding gas, reduce the
		percentage of helium.
	6.	Check the welding cables for
		loose or faulty connections.
When AC TIG welding, the arc is	1.	The tungsten electrode may be	1. Check components R5 and C6
erratic and there is a loss of “clean-		small for the process. Use a	in the high voltage transformer
ing” of the work piece.		larger diameter tungsten or a	primary circuit.
		pure tungsten.	2. Perform the SCR Bridge Test.
	2.	If a helium blend is used as a
		shielding gas, reduce the per-
		centage of helium.

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

SQUARE WAVE TIG 275