Lincoln Electric SVM166-A service manual Welding Problems

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F-8	TROUBLESHOOTING & REPAIR			F-8
TROUBLESHOOTING GUIDE			Observe Safety Guidelines
		detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		WELDING PROBLEMS
No shielding gas.		1. Make sure the gas supply is ade-	1. If the gas solenoid is not operat-
		quate and the gas hoses are not	ing perform the Gas Solenoid
		loose or kinked.	Test.
			2. The Control Board may be faulty.
The shielding gas turns on sporad-		1. The pressure in the gas line may	1. Perform the Gas Solenoid Test.
ically, or remains on all the time.		have exceeded 80psi (5.5 bar)	2. The Control Board may be faulty.
The Display board shows “POS”		1. The LN-15 is in the “Press and	1. The Control board may be faulty.
“PRE” or “BRN”.		Spin” set-up mode.
			2. The Display Board may be faulty.
		2. One of the dip switches on the
		control board is set to “ON” for
		the timer setting mode.
		1. The part being welded may be
There is porosity in the weld.		wet or very dirty.
		2. The electrode being used may
		be wet or rusty.
		3. The shielding gas may be wrong
		for the process.
		4. There may not be enough shield-
		ing gas.
		5. Make sure the wire feed speed
		and arc voltage are correct for
		the process.
The welding arc burns back to the		1. Check the wire feeding path for	1. Perform the Wire Drive Motor
tip.		mechanical restrictions,	Test.
		2. Make sure the polarity is correct	2. Perform the Hall Effect Module
		for the process.	Test.
		3. The contact tip may be worn.
		4. The welding voltage may be set
		too high or the wire feed speed
		set too low.
		5. Check the wire drive tension.

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.

LN-15