Lincoln Electric SVM144-B service manual Function Problems

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F-7	TROUBLESHOOTING & REPAIR					F-7
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
No control of arc voltage. Wire feed-		1. The arc voltage control poten-		1.	The arc voltage control poten-
ing is normal.			tiometer may be dirty. Rotate		tiometer may be faulty. Check or
			several times and check if prob-		replace. See Wiring Diagram.
			lem is resolved.
				2.	Perform the SCR Rectifier
					Assembly Tests.
				3.	The control board may be faulty.
					Replace.
There is no gas flow when gun trig-		1. Check gas source and hoses for		1.	Check the gas solenoid by dis-
ger is pulled. Wire feeds and weld			leaks or kinks.		connecting it from the control
voltage is present.					board (Plug J8) and applying a
					12 VDC external supply to the
					gas solenoid. If the solenoid
					does NOT activate then it may
					be faulty. Replace.
				2.	The control broad may be faulty.
					Replace.
The machine stops feeding wire		1.	Check for adequate wire supply.	1.	Check the motor armature cur-
while welding.					rent. Normal armature current is
		2.	Check for mechanical restric-		2.0 to 2.7 amps maximum.	If
			tions in the wire feeding path.		the motor armature current is
			The gun may be clogged.		normal the control board may be
					faulty. Replace.
		3. Check gun liner and tip are cor-
			rect for wire size being used.	2.	If the motor armature current is
					high (over 2.7 amps) and there
		4. Check spindle for ease of rota-			are NO restrictions in the wire
			tion.		feeding path then the motor or
					gear box may be defective.
		5. If Timer Option Kit is installed,			Replace.
			make sure spot timer knob is set
			to OFF.

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.

POWER MIG 255