Lincoln Electric SVM170-A service manual Troubleshooting Guide, Output Problems

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F-4 TROUBLESHOOTING AND REPAIR F-4

TROUBLESHOOTING GUIDE

Observe all Safety Guidelines detailed throughout 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 the machine is not
		connected to a portable genera-
		tor.

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.

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POWER MIG 255C