Lincoln Electric SVM168-B service manual Adjustment Test

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F-7	TROUBLESHOOTING & REPAIR					F-7
TROUBLESHOOTING GUIDE				Observe Safety Guidelines
		detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		OUTPUT PROBLEMS
Machine has low welding output		1. The brushes may be worn.	1.	If the engine HIGH IDLE RPM is
and low auxiliary output.		Contact your local Lincoln		low, then perform The Throttle
		Authorized Service Facility.		Adjustment Test.
		2. The engine RPM may be low.	2.	Perform the	Rotor	Voltage
				Test.
			3.	If the rotor voltage is low the
				Field Capacitor (C1) or the Field
				Bridge (D2) may be faulty. Test
				and replace if necessary.
			4.	Check the Output		Control
				Potentiometer.	Normal resis-
				tance is 10,000 ohms. Also
				check associated wiring for
				loose or faulty connections.
			5.	The Rotor may be faulty.
				Perform the Rotor Resistance
				Test.
			6.	The Printed Circuit Board may
				be faulty. Replace.
			7.	If the engine HIGH IDLE RPM is
				OK, then the engine may have
				lost horsepower and be in need
				of major repair.

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 1-888-935-3877.

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