Lincoln Electric SP-250 service manual Function Problems

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F-6	TROUBLESHOOTING & REPAIR								F-6
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
PROBLEMS			POSSIBLE AREAS OF					RECOMMENDED
(SYMPTOMS)			MISADJUSTMENTS(S)					COURSE OF ACTION
			FUNCTION PROBLEMS
The audio alarm does NOT sound		1.	The background noise may be				1.	Check the voltage across pins
when a key is pressed, but display			too loud for user to hear beeper.					1J7 (+) to 2J7 (-) on the control
changes.								board. When the keys are
								pressed there should be a brief
								indication, or pulse, of a DC volt-
								age. If the voltage "pulse" is pre-
								sent then the Piezo alarm may
								be defective.- Replace.
								If the DC voltage pulse is NOT
								present when the keys are
								pressed then the control board
								may be defective.-Replace.
The audio alarm does not sound		1.	Remove the gun. If the problem				1.	Perform the Keypad Test.
when a key is pressed, and the dis-			is resolved the gun is faulty.-
play does NOT change.			Replace.				2.	The control board may be faulty.
								- Replace.
							3.	The LCD Display may be faulty.-
								Replace.
		1.	Make certain that a process is				1.	Check the gas solenoid by dis-
There is no gas flow when gun trig-			selected that requires gas flow.					connecting it from the control
ger is pulled. Wire feeds and weld								board (Plug J8) and applying a
voltage is present. The display func-		2.	Check gas source and hoses for					12VDC external supply to the
tions properly.			leaks or kinks.					gas solenoid. If the solenoid
								does NOT activate then it may
								be faulty. - Replace.
							2.	The control board may be faulty.-
								Replace.
No readable message on the dis-		1.	Check the input voltage at the				1.	The display board may be faulty.
play. Backlight is lit indicating there			machine.	The	input	voltage		Replace.
is power to the machine.			must match the rating plate and
			the reconnect panel.				2.	The control board may be faulty.
								Replace.
		2.	Turn the line switch (S1) off.
			Wait a minute and turn power
			on. If problem is not resolved
			contact	your	local	Lincoln
			Electric Authorized Field Service
			Facility.

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