Lincoln Electric SVM 122-A service manual Rectifier Bridge Test

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F-6				F-6
	TROUBLESHOOTING & REPAIR
	Observe Safety Guidelines		TROUBLESHOOTING GUIDE
	detailed in the beginning of this manual.
	PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
		OUTPUT PROBLEMS
	The input contactor operates – the	1. If the amber thermal protection	1.	Perform the Main Transformer
	fan runs – the pilot light is lit – but	light is lit, the primary or sec-		Test.
	the machine has no welding out-	ondary thermostat is open.	2.	Perform the SCR/Diode
	put.	Allow machine to cool.
				Rectifier Bridge Test.
		2. Make certain the output trigger	3.	The control board may be
		circuit (#2 and #4) is being acti-
				faulty. Replace.
		vated either by an external “clo-
		sure” or by the output terminals
		switch (S3).
		3. Check the 10A circuit breaker in
		the 42VAC line.
		4. If remote control is not being
		used, make certain the Output
		Control switch (S2) is in the
		OUTPUT CONTROL “LOCAL”
		position.
		5. Check for loose or faulty weld
		cable connections.

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 216-383-2531 or 1-800-833-9353.

IDEALARC DC-400

LINCOLN ®

ELECTRIC