Lincoln Electric SVM100-A service manual 12/95 Square Wave TIG

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

		TROUBLESHOOTING & REPAIR				F-4
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
	The voltmeter reads “00” in Stick		1. Inspect to assure that the arc	1.	Check for loose connectors at
	Mode, and there is no output from		start switch is in the on		the SCR bridge and at the
	the machine when in the TIG		(closed) position when		Protection/Snubber board. (J10)
	2-Step Mode.		welding in the TIG Mode.		and (J11). See Figure F.2 at
					end of this Guide for location.
				2.	Check the wiring to the Control
					Transformer (T2). Observe
					directions on decal.
				3.	The Protection/Snubber board
					may be faulty. See
					Protection/Snubber Board
					Continuity Test.
				4.	Check the Control Transformer
					(T2). See Control Transformer
					Voltage Test.
				5.	Check the polarity switch (S2)
					for loose or broken connections.
				6.	Check the SCR bridge. See
					Static and Active SCR Tests.
				7.	If all previous tests are OK -
					then replace the Control board.
	Machine does not respond (no gas		1. Machine MUST be in one of	1.	Check trigger circuit. See Arc
	flow, no high frequency and no		the TIG Modes.		Start Trigger Circuit Test
	open circuit voltage) when arc			2.	Check the Control transformer
	switch or amptrol is activated -		2. The arc start switch or amptrol
	displays and fan working. Note:		may be defective. Check for		(T2). See Control Transformer
	Machine may have OCV in the		continuity between pins “D”		Voltage Test.
	Stick Mode.		and “E” on cable connector	3.	Protection/Snubber board may
			when arc switch or amptrol is
			activated.		be faulty. See
					Protection/Snubber Board
					Continuity Test.
				4.	If all previous tests are OK -
					then replace the Control board.

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.

12/95 SQUARE WAVE TIG 255