Lincoln Electric SVM127-A service manual Trigger Interlock Function Problems

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F-10			F-10
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
		TRIGGER INTERLOCK
		FUNCTION PROBLEMS
The wire feeds when the interlock	1.	Check to see if the reed switch	1. Check the 2CR reed switch for
switch is in the "ON" position. No		2CR is stuck closed.	sticking and associated leads
welding or gun trigger activation.			(#529 and #628) for shorts.
			2. The power PC board may be
			faulty. Replace.
With the interlock switch in the	1.	Check leads #529 and #628 for	1. The 2CR reed switch may be
"ON" position, the wire feed stops		loose or faulty connections	faulty. Check to see if it closes
when the gun trigger is released.		between the 2CR reed switch	when welding.
		and the power PC board.	2. Check the continuity (zero
			ohms) of leads #529 and #628
			from the 2CR reed switch to the
			power PC board. Also check
			continuity of leads #530 and
			#522 from the power PC board
			to the interlock switch. See the
			Wiring Diagram.
			3. Check the interlock switch for
			proper operation.
			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