Lincoln Electric SVM127-A service manual Trigger

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F-6						F-6
	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
		FUNCTION PROBLEMS
	No wire feed when gun trigger is	1. The Ground Lead Protector	1.	The 1CR relay on the power PC
	activated. The drive rolls do not	may have tripped. Reset and		board may be faulty. Check or
	turn. The digital meter does light	clear possible fault between		replace.
	but reads only the SET voltage and	electrode circuit and feeder	2.	Check resistor R1.		Normal
	wire speed values.	frame.
				resistance is 2 ohms. See the
		2. The gun trigger may be faulty.		Wiring Diagram.
			3.	Perform	the	Trigger
				Transformer T2 Test.
			3.	Perform	the Trigger	Board
				Test.
			4.	Perform the Wire Drive Motor
				Test.
			5.	If the wire drive motor is OK,
				then the power PC board or the
				control PC board may be faulty.

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