Lincoln Electric SVM127-A service manual Troubleshooting Guide, Observe Safety Guidelines

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F-4	TROUBLESHOOTING & REPAIR			F-4
Observe Safety Guidelines			TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		FUNCTION PROBLEMS
No wire feed when gun trigger is		1. Make sure 115VAC is being	1. Check for loose or faulty lead
activated.	The digital meter does	applied to the LN-9 at the input	connections between the input
NOT light.	The drive rolls do not	connector. Pin "C" is lead #31	connector, the T1 transformer,
turn.		and pin "D" is lead #32.	and the power PC board.
		2. Check the 5 amp circuit breaker.	2. The T1 transformer may be
		Reset if tripped.	faulty.	Perform the T1
		3. The F101 1/2 amp fuse, located	Transformer Test.
		on the power PC board, may be
		blown.
No wire feed when gun trigger is		1. The wire drive motor may be	1. Check for loose or faulty con-
activated. The digital meter DOES		over heated, and the thermal	nections on leads #527 and
light but reads zero in both (set and		protector has tripped. Let unit	#528 between the wire drive
actual) volts and wire speed.		cool.	motor and the power PC board.
			2. Perform the T1 Transformer
			Test. Replace if faulty.
			3. The power PC 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, 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 Wire Feeder