Lincoln Electric SVM153-A service manual Justment 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 machine has welding output	1. If a remote control unit is con-	1. Check the OUTPUT control
but no control of output. The auxil-	nected to the machine, check	potentiometer and related
iary power is normal.	the remote control and related	leads. See the Wiring Diagram.
	cable.	2. Check the shunt and associated
	2. Check the welding and work	feedback leads. See the Wiring
	cables for loose or faulty con-	Diagram.
	nections.	3. Check the voltage feedback
		leads for loose or faulty connec-
		tions. See the Wiring Diagram.
		4. Perform the Power Module
		Test.
		5. The Weld Control PC board
		may be faulty.
		5. See the Start-Up and OCV
		Diagnostic Chart.
The machine has low welding out-	1. Check the brushes for wear and	1. If the engine high idle speed is
put and low auxiliary output.	proper contact to the slip rings.	low, perform the Throttle Ad-
	2. The engine RPM may be low.	justment Test.
		2. Perform the Rotor Resistance
		Test.
		3. Perform the Flashing and
		Rotor Voltage Test. If the rotor
		voltage is low, the field capacitor
		or field bridge may be faulty.
		Test and replace if necessary.
		See the Wiring Diagram.
		4. 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, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353.

COMMANDER 500