Lincoln Electric SVM101-B service manual See Switch Board test

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F-9	TROUBLESHOOTING & REPAIR				F-9
TROUBLESHOOTING GUIDE				Observe Safety Guidelines
		detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		FEEDING PROBLEMS
Poor stick electrode performance.		Check output welding cables.	1.	Check for loose or burned con-
Arc pops out.				nections at choke, shunt, and
		Is electrode DRY? Try welding with		output studs. See wiring dia-
		another electrode from a different		gram in Section G.
		container.
			2.	Test and inspect D6, D12, L1
		Make sure you have the correct		and L2. See Wiring Daigram in
		electrode for your application.		Section G.
Machine makes “squealing”	noise	Check input lines and connections.	1.	See Switch Board test.
while under load when welding.
Output power is low (less than 20		Check input voltage and reconnec-	2.	See Snubber Resistor test.
VDC on meter @ 100 amps). Input		tion procedures
voltage 230 VAC or lower.			3.	See Output Diode Test.

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.

V300-I