Lincoln Electric SVM153-A service manual Troubleshooting Guide, Observe Safety Guidelines

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F-4									F-4
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
	OUTPUT PROBLEMS
Major physical or electrical damage	1. Contact your local Lincoln					1.	Contact the	Lincoln Electric
is evident.	Authorized			Field	Service		Service Department at 1-800-
	Facility.						833-9353 (WELD)
No welding output in neither Stick	1. Place the Welding Terminals					1.	Check for loose or faulty con-
or CV modes. The engine operates	Switch in the "ALWAYS ON"						nections on the heavy current
normally. The auxiliary output is	position.		If	the problem is			carrying leads between the out-
normal.	solved, the fault may be in the						put bridge, the power modules,
	external control cable (if used),						the choke and the output termi-
	leads #2		and #4.		See the		nals.
	Wiring Diagram.					2.	Check the Welding Terminals
	2. With the engine at high idle						Switch and	associated	leads.
	(1900RPM), the machine in the						See the Wiring Diagram.
	Stick mode and the OUTPUT					3.	Check gate	leads #23,	#23A,
	CONTROL at maximum, check
							#25 and #25A for loose or faulty
	for the	presence of			approxi-
							connections.	See the	Wiring
	mately 87VDC (open circuit volt-
							Diagram.
	age) at the output terminals.
	3. If the correct OCV is present at					4.	Perform the	Stator Voltage
							Test.
	the welding			output	terminals
	check	the		welding	cables,	5.	Perform the	Output Rectifier
	clamps and electrode holder for						Bridge Test.
	loose or faulty connections.					6.	Perform the	Power Module
							Test.
						7.	Perform the	Analog	Power
							Supply PC Board Test.
						8.	The Weld Control PC Board
							may be faulty.
						9.	See the Start-Up and OCV
							Diagnostic Chart.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353.

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