Lincoln Electric SVM189-B service manual Welding Problems

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F-7	TROUBLESHOOTING & REPAIR			F-7
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		WELDING PROBLEMS
The arc is unstable - poor		1. Check for correct input voltage	1. Check for 17 to 33 VDC
starting.		to the machine.	(dependent on Arc Voltage
		2. Check for proper electrode	Control Setting) at the
			machine’s output terminals. If
		polarity for process.
			present check gun and work
		3. Check gun tip for wear or	cable.
		damage-Replace.	2. If OCV is low, check output
		4. Check for proper gas and flow	capacitor and output diodes.
		rate for process.	3. Check for loose connections
		5. Check work cable for loose or	at the output terminals, the
			choke and all heavy current
		faulty connections.
			carrying leads. See Wiring
		6. Check gun for damage or	Diagram.
		breaks	4. The Control P.C. Board may
			be faulty. Replace.
		GAS FLOW PROBLEMS
Low or no gas flow when gun		1. Check gas supply, flow	1. Check the gas solenoid by
trigger is pulled. Wire feed, weld		regulator and gas hoses.	disconnecting it from the
output and fan operate normally.		2. Check gun connection to	control board and applying a
			12 vdc external supply to the
		machine for obstruction or
			gas solenoid. If solenoid does
		leaky seals.
			not activate it may be faulty.
			Replace.
			2. The control P.C. board may
			be faulty. Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

COMPACT WIRE WELDERS