Lincoln Electric SVM 122-A service manual Output Problems

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F-8					F-8
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 machine has minimum welding	1. If remote control is being used,			1. Check the Output Control
output and no control.	set the Output Control switch			potentiometer (R4) and associ-
	(S2) in the OUTPUT CONTROL			ated wiring.	See Wiring
	“LOCAL”	position	and control	Diagram.
	the weld	output	with the	2. Check the welding Mode switch
	machine Control potentiometer
				(S4), the microswitches, and the
	(R4). If the problem is solved,
				associated wiring.
	check the remote control unit
	(or wire feeder) and associated			3. Check the Output Control
	control cable.			switch (S2) and	associated
	2. Make certain the remote control			wiring. See Wiring Diagram.
	leads (#75, #76 and #77) are not			4. Perform the Main Transformer
	grounded to the positive weld-			Test.
	ing output.			5. Perform the SCR/Diode Rec-
	3. Make certain the three-phase			tifier Bridge Test.
	input voltage is correct and			6. The control board may be faulty.
	matches the machine rating and
				Replace.
	the reconnect panel.

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