Lincoln Electric SVM138-A service manual Starting Problems

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F-23				F-23
	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
			STARTING PROBLEMS
	The arc voltage appears to rise too	1.	Adjust the "start" trimmer on the	1. The voltage PC board may be
	slowly or stubs or blasts at the start		voltage PC board. It should be	faulty. Replace.
	of a weld. Once started the weld-		slightly higher than the weld
	ing is good.		voltage. See Starting Charac-
	NOTE: Pulse Power 500 operation		teristics in the Operation section
			of this manual.
	with a filter kit may exhibit these
	symptoms.	3.	Put the Lincoln power source in
			the "Machine Control" mode.
			Jumper the "BYPASS" pins on
			the LN-9 GMA voltage PC
			board. Adjust the weld voltage
			from the power source for the
			process being used. If the cor-
			rect voltage cannot be set, the
			power source may be faulty.
		4. Check for correct control cable
			connections to the power supply.

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.

LN-9 GMA Wire Feeder