Lincoln Electric SVM133-B service manual Tight Check solenoid Waveforms as Illustrated

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F-9					F-9
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
	ENGINE PROBLEMS
The machine goes to low idle but	1. Make sure there is NOT an	1.	The idler solenoid linkage may
does not stay at low idle.	external load (auxiliary or weld)		be misadjusted or damaged.
	connected to the Commander	2.	The idler solenoid hold-in circuit-
	400.
			ry may be faulty. Check leads
			#237 and #226 for loose or faulty
			connections.	See the Wiring
			Diagram.
		3.	Perform the Idler Solenoid Test.
		4.	Make sure the control board
			mounting/grounding screws are
			tight.
		5.	Check solenoid		waveforms as
			illustrated in	the	Oscilloscope
			Waveforms Section.
		6.	The control board may be faulty.
			Replace.
The engine will not crank or cranks	1. Check for loose, faulty, or cor-	1.	The starter motor, solenoid or
very slowly.	roded battery cable connections.		push button may be faulty.
	2. Check the leads and connec-		Check or replace.
	tions at the starter solenoid and	2.	The engine may be hard to
	the start push button.		crank due to a mechanical fail-
	3. The battery may be faulty.		ure in the engine.

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 (WELD).

Commander 400