Lincoln Electric SVM151-A Troubleshooting Guide, Perform the DC Buss Supply, Board Test

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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)
The Multi-Weld 350 is completely	1. Make sure the power source is		1.	Measure the input voltage to the
dead. The meters do not light and	working properly and supplying			Multi-Weld 350.		It must be
the input contactor does not acti-	at least 50VDC to the Multi-			between 50 and 113VDC.
vate when the ON/OFF Mode	Weld 350.	The electrode cable	2.	The ON/OFF	Mode Selector
Selector switch is turned on.	must be positive polarity and the
				switch (S1)	may	be faulty.
	work cable negative polarity.
				Check and replace if faulty. See
	2. Check the electrode and work			the Wiring Diagram. Also check
	cables for loose or faulty con-			associated wiring.
	nections.		3.	The input diode D1/D2 may be
				open. Check. See the Wiring
				Diagram.
			4.	Perform the DC Buss Supply
				Board Test.
			5.	Perform the	Analog Control
				Power Supply Board Test.
			6.	The Weld Control Board may be
				faulty. Replace.

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.

MULTI-WELD 350