Lincoln Electric SP-250 service manual Output Problems

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F-3	TROUBLESHOOTING & REPAIR									F-3
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS		POSSIBLE AREAS OF				RECOMMENDED
	(SYMPTOMS)		MISADJUSTMENTS(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. (216) 383-2531 or
			Facility.				1-800-833-9353 (WELD)
Machine is dead - No Open Circuit		1.	Make certain that the input			1.	Check input power switch (S1).
Voltage output and No Wire Feed			power switch is in the "ON" posi-				It may be faulty.
when gun	trigger is pulled. No		tion.
Display.						2.	Check for loose or broken wires
		2.	Check the input voltage at the				at the reconnect panel.
			machine.	Input	voltage must
			match the rating plate and the			3.	Perform Main Transformer Test.
			reconnect panel.
		3.	Blown or missing fuses in the
			input line.
No Open Circuit Voltage output but		1.	Check the input voltage at the			1.	Check for loose or broken con-
wire feeds normally when gun trigger			machine.	Input	voltage must		nections at the output terminals,
is pulled. -	Display lights properly.		match the rating plate and the				the choke, the capacitor bank
			reconnect panel - High or Low				and all heavy current carrying
			Line message may be displayed.				leads.
		2.	The gun may be faulty. Check or			2.	Make sure that the transformer
			replace.				secondary	leads are		securely
							connected to the SCR Rectifier
							Assembly.
						3.	Perform	the	SCR	Rectifier
							Assembly Test.
						4.	The Control 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, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216- 383-2531 or 1-800-833-9353

IDEALARC SP-250