Lincoln Electric SVM144-B service manual Output Problems

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F-4	TROUBLESHOOTING & REPAIR						F-4
TROUBLESHOOTING GUIDE						Observe Safety Guidelines
				detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF			RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)			COURSE OF ACTION
			OUTPUT PROBLEMS
Major Physical or Electrical Damage		1.	Contact your local Lincoln		1.	Contact	The Lincoln Electric
is Evident			Electric Authorized Field Service			Service Dept. 1-888-935-3877
			Facility.
					1.	Check input power switch (S1).
Machine is dead — no open circuit		1.	Make certain that the input			It may be faulty.
voltage output and no wire feed			power switch is in the "ON" posi-
when gun trigger is pulled. The			tion.		2.	Check for lose or broken wires
machine display may be lit.						at the reconnect panel.
		2.	Check the input voltage at the
			machine. Input voltage must		3.	Perform	Main Transformer
			match the rating plate and the			Test.
			reconnect panel.
					4.	Perform Rectifier Diode Bridge
		3.	Blown or missing fuses in the			Test.
			input line.
					5.	Check	the thermostats and
		4.	The thermostats may be open			associated leads for loose or
			due to machine overheating.	If		broken connections. See wiring
			machine operates normally after			diagram.
			a cooling off period then check
			for proper fan operation and		6.	The control board may be faulty.
			ventilation. Make certain that the			Replace.
			machine's duty cycle is not
			being exceeded.
		5.	Check the trigger circuit. Leads
			#324 to #325 should have conti-
			nuity (zero ohms) when the gun
			trigger is pulled. If not then the
			gun may be faulty — replace.
		6. Make sure unit is not connected
			to a portable generator.

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