Lincoln Electric SVM166-A service manual Feeding Problems

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F-4	TROUBLESHOOTING & REPAIR				F-4
TROUBLESHOOTING GUIDE				Observe Safety Guidelines
			detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)		COURSE OF ACTION
		FEEDING PROBLEMS
Major physical or electrical damage		1. Contact your local authorized		1. Contact the Lincoln Electric
is evident when the sheet metal		Lincoln	Electric Field Service	Service Department,
cover(s) are removed.		Facility for assistance.		1-888-935-3877.
The LN-15 does not “power-up”		1. Make sure the correct input volt-		1. Check the on/off switch.	See
when the on/off switch is turned to		age is being applied (15 to		the wiring diagram.
the ”ON”position.		110VDC).	See Specifications	2. Check the input rectifier bridge.
		Pages.
				See the wiring diagram.
		2. Make certain the “Work Clip” is		3. Perform the Boost Power
		attached securely to the work		Supply Board Test.
		piece.		4. The control board may be faulty.
				5. If the Display Board is not lit
				check the input voltages to the
				Display Board. See the Wiring
				Diagram.
When the gun trigger is activated		1. Make sure the contactor is func-		1. Perform The Contactor Test.
the wire drive runs and electrode		tioning correctly.
wire feeds, but there is no welding				2. The Control Board may be faulty.
output.		2. Check the current carrying leads
		at the contactor and between
		the contactor and the feed plate
		for loose or faulty connections.
		See the Wiring Diagram.
		3. Make sure the welding gun is
		connected correctly and func-
		tioning correctly.
		4. Make certain the DC power
		source is functioning correctly.

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 1-888-935-3877.

LN-15