Lincoln Electric SVM134-A service manual Troubleshooting & Repair

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F-10	TROUBLESHOOTING & REPAIR					F-10
Observe Safety Guidelines				TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)		COURSE OF ACTION
			FUNCTION PROBLEMS
The engine will NOT go to high		1.	Check welding cables for loose	1. Check the reed switch (CR2) for
speed when a load is applied to the			or faulty connections.		proper operation. The	reed
welding output terminals.	The				switch should close when there
engine does go to high speed when					is current flow in the welding cir-
a load is applied to the DC auxiliary					cuit.
power receptacle.				2. Locate the red lead connected
					to the idler PC board. While
					leaving the red lead connected,
					jumper the red lead to frame
					ground. If the engine goes to
					high speed, the fault is in the
					reed switch or associated leads.
					See the Wiring Diagram.
				3. If the engine does NOT go to
					high speed (in step 2), the idler
					PC board may be faulty.
The engine will NOT go to high		1.	Check the auxiliary power plug	1.	Check the black “B” leads con		-
speed when a load is applied to the			and associated leads for loose		nected to the idler PC board and
DC auxiliary receptacle.	The		or faulty connections.		associated connections.	See
engine does go to high speed when		2. The load may be too small. The			the Wiring Diagram.
a load is applied to the welding out-
			load must be above 150 watts.	2.	The idler PC board may be
put terminals.
					faulty.

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 1-800-833-9353.

CLASSIC I