Lincoln Electric SP-250 Liquid elec, Trolyte in these capacitors is, Portion of your body

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F-9	TROUBLESHOOTING & REPAIR									F-9
	TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS		POSSIBLE AREAS OF		RECOMMENDED
	(SYMPTOMS)		MISADJUSTMENTS(S)		COURSE OF ACTION
			WELDING PROBLEMS
The arc is unstable and or "hunting".		1.	Check for worn or melted con-	1.	Check for loose connections at
			tact tip.		the output terminals, the choke,
					the capacitor bank and all heavy
		2.	Check for loose or faulty con-		current carrying leads.
			nections on the work and elec-
			trode cables.	2.	Make sure that the transformer
					secondary			leads	are	securely
		3.	Make sure electrode polarity is		connected to the SCR Rectifier
			correct or welding process being		Assembly.
			used.
				3.	The output capacitor bank may
		4.	Check for rusty or dirty wire.		be faulty.		Check for loose con-
					nections at the capacitors. Also
		5.	Make sure machine settings and		check	for		leaky	capacitors.
			gas are correct for process		Replace if necessary.
			being used.		WARNING:			The	liquid elec-
					trolyte in these capacitors is
					toxic. Avoid contact with any
					portion of your body.
				4.	The control board may be faulty.
					Replace.
Weld bead is narrow or ropey. May		1.	Make sure the weld procedure	1.	The output capacitor bank may
have porosity with electrode stub-			and electrode polarity is correct		be faulty.		Check for loose con-
bing into plate.			for the process being used.		nections at the capacitors. Also
					check	for		leaky	capacitors.
		2.	Make sure shielding gas is cor-		Replace if necessary.
			rect and flow is proper.		WARNING:			The	liquid elec-
					trolyte in these capacitors is
		3.	Make sure the weld joint is not		toxic. Avoid contact with any
			"contaminated".		portion of your body.
				2.	Perform		the SCR			Rectifier
					Assembly Test.
				3.	The control board may be faulty.
					Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216- 383-2531 or 1-800-833-9353

IDEALARC SP-250