Lincoln Electric SP-100 service manual Troubleshooting Guide

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F-7			TROUBLESHOOTING & REPAIR
	Observe Safety Guidelines			TROUBLESHOOTING GUIDE
	detailed in the beginning of this manual.
		PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
		(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
				GAS FLOW PROBLEMS
		Low or no gas flow when gun		1. Check gas supply, flow regulator	1. Check for 115 vac at the gas
		trigger is pulled. Wire feed, weld		and gas hoses.	solenoid leads #7 to #32A. If the
		output and fan operate normally.			correct voltage is present but
				2. Check gun connection to	the solenoid does not activate,
				machine for obstruction or leaky	replace solenoid. See wiring dia-
				seals.	gram .
					2. If voltage is not present at leads
					#7 to #32A, remove main supply
					power to machine. Test leads #7
					and #32A for continuity (zero
					ohms) to the control board.
					3. Control board may be faulty.
					Replace.
		PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
		(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
				WELDING PROBLEMS
		Arc is unstable – Poor starting		1. Check for correct input voltage	1. Check for correct open circuit
				to machine – 115 vac.	voltage (OCV) at machine’s out-
					put terminals, 10 vdc to 28 vdc,
				2. Check for proper electrode	depending on arc voltage con-
				polarity for process.	trol setting. If correct OCV is
					present check gun and work
				3. Check gun tip for wear or dam-	cable.
				age – Replace.
					2. If OCV is low, check output
				4. Check for proper gas and flow	capacitor and output diodes.
				rate for process.
					3. Check arc voltage control poten-
				5. Check work cable for loose or	tiometer and associated wires
				faulty connections.	#205, #206 and #207 for loose
					or broken connections. See
				6. Check gun for damage or	wiring diagram.
				breaks.
					4. 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, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216-383-2531 or 1-800-833-9353.

SP-100