Lincoln Electric IM-939A, LN-25, 11523, 11389 specifications Output Problems

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

LN-25 PRO EXTREME

E-3	TROUBLESHOOTING	E-3
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

Output Problems

The feeder does power up - no dis-	1.	The work sense lead is discon-	1.	Connect the work sense lead to
play, no cold feed.		nected or is a poor electrical con-		the work in a location free of dirt,
		nection. (Across the arc models)		rust and paint.
	2.	The power source is OFF.	2.	Turn ON the power source.
	3.	The circuit breaker for the wire	3.	Reset the circuit breakers.
		feeder on power source have
		tripped. (control cable models)
	4.	The control cable may be loose or	4.	Tighten, repair or replace the con-
		damaged. (control cable models)		trol cable.
No shielding gas.	1.	The gas supply is OFF or empty.	1.	Verify the gas supply is ON and
	2.	The gas hose is cut or crushed		flowing.
			2.	Route the gas hose so it avoids
				sharp corners and make sure
				nothing is on top of it. Repair or
	3.	The flow meter valve is closed.		replace damaged hoses.
			3.	Open the flow meter valve.
	4.	Dirt or debris is in the solenoid.	4.	Apply filtered shop at 80psi to the
	5.	There is a loose solenoid connec-		solenoid to remove dirt.
			5.	Remove the cover and check that
		tion.		all connections are in good condi-
	6.	The solenoid has failed.		tion.
Inconsistent wire feeding or wire not	1.	The gun cable is kinked and/or	1.	Keep the gun cable as straight as
feeding but drive rolls turning.		twisted		possible. Avoid sharp corners or
	2.	The wire is jammed in the gun and		bends in the cable.
			2.	Remove the gun from the wire
		cable.		feeder and pull the jammed wire
	3.	The gun liner is dirty or worn.		out of the gun and cable.
			3.	Blow dirt out of the liner with low
				pressure (40psi or less). Replace
	4.	The electrode is rusty or dirty.		the liner if worn.
			4.	Use only clean electrode. Use
				quality electrode, like L-50 or L-56
	5.	The contact tip is partially melted		from Lincoln Electric.
			5.	Replace the contact tip.
		or has spatter.
	6.	Improper gun liner, tip, drive rolls	6.	Verify the proper parts are
		and/or inner wire guide.		installed.
	7.	Incorrect tension arm pressure on	7.	Adjust the tension arm per the
		the drive rolls.		Instruction Manual. Most elec-
				trodes feed well at a tension arm
	8.	The spindle brake is too tight.		setting of "3".
			8.	Verify the spool of wire moves
	9.	Worn drive roll		with minimal effort.
			9.	Replace the drive rolls if worn or
				filled with dirt.