Lincoln Electric SVM127-A service manual Perform the T1 Transformer

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F-11				F-11
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
	FUNCTION PROBLEMS
The SET voltage is erratic or not	1. Check for loose or faulty con-	1.	Remove power to the LN-9 and
adjustable over the entire range of	nections on leads #634, #635		disconnect Plug J1 from the
control. The actual voltage is also	and #636 between the voltage		voltage PC board. Check the
erratic like the SET voltage.	control potentiometer (R3) and		resistance of the voltage control
	the voltage PC board.		potentiometer (R3).	When
			measured from the wiper (lead
			#635) to lead #634, the resis-
			tance should vary	smoothly
			from 0 to 10,000 ohms when the
			shaft is rotated.
		2.	The voltage PC board may be
			faulty. Replace.
The field fuse (F101), located on	1. Very rapid and repetitive gun	1.	Perform the T1 Transformer
the power PC board, repeatedly	triggering can possibly cause		Test.
fails.	the field fuse to fail.	2.	Perform the Wire Drive Motor
			Test.
		3.	Disconnect the meter board. If
			the problem is resolved, the
			meter board may be faulty.
		4.	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