Lincoln Electric SVM 122-A service manual Make sure welding process is

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F-14		F-14
	TROUBLESHOOTING & REPAIR
	TROUBLESHOOTING GUIDE	Observe Safety Guidelines
		detailed in the beginning of this manual.

PROBLEMS	POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)		COURSE OF ACTION
		WELDING PROBLEMS
The Arc Force control (R5) has no	1.	The Arc Force control is active	1. Check the Arc Force control
effect on the arc.		only in the Stick Mode.	potentiometer (R5) for		correct
	2. The effect of the Arc Force con-		resistance and	proper	opera-
			tion. Normal	resistanace is
		trol will be less noticeable at
			10,000 ohms.
		high welding currents. Weld at
		low currents (less than 150	2. Check the continuity of leads
		amps) and check the Arc Force	#204, #208, and #209 from the
		control function.	Arc Force control to the control
			board.
			3. The control board may be
			faulty. Replace.
The welding arc is variable and	1.	Check the input voltage at the	1. Check the welding Mode switch
sluggish.		DC-400, making sure the cor-	(S4), the microswitches, and the
		rect voltage and all three	associated wiring.
		phases are being applied to the	2. Perform the SCR/Diode Rec-
		machine.
			tifier Bridge Test.
	2.	Make sure welding process is	3. Perform the Main Transformer
		correct for machine settings.
			Test.
	3. Check welding cables for loose		4. The control board may be faulty.
		or faulty connections. Also
			Replace.
		make sure cables are sized cor-
		rectly for welding current.

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