Lincoln Electric SVM194-A HOW to USE Troubleshooting Guide, Recommended, Locate Problem Symptom

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F-2	TROUBLESHOOTING AND REPAIR				F-2
	HOW TO USE TROUBLESHOOTING GUIDE
				WARNING
	Service and Repair s	hould only be performed by Lincoln Electric Factory Trained
	Personnel. Unauthorized repairs performed on this equipment may result in danger to
	the technician and machine operator and will invalidate your factory warranty. For your
	safety and to avoid Electrical Shock, please observe all safety notes and precautions
	detailed throughout this manual.
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This Troubleshooting Guide is provided to				Step 3. RECOMMENDED
help you locate and repair possible machine				COURSE OF ACTION
malfunctions. Simply follow the three-step				The last column labeled “Recommended
procedure listed below.				Course of Action” lists the most likely com-
				ponents that may have failed in your
Step 1. LOCATE PROBLEM (SYMPTOM).				machine. It also specifies the appropriate
Look under the column labeled “PROBLEM				test procedure to verify that the subject com-
(SYMPTOMS)”. This column describes pos-				ponent is either good or bad. If there are a
sible symptoms that the machine may exhib-				number of possible components, check the
it.	Find the listing that best describes the			components in the order listed	to eliminate
symptom that the machine is exhibiting.				one possibility at a time until you locate the
Symptoms are grouped into the following				cause of your problem.
categories: output problems, function prob-				All of the referenced test procedures
lems and welding problems.
				referred to in the Troubleshooting Guide are
Step 2. PERFORM EXTERNAL TESTS.				described in detail at the end of this chapter.
The second column labeled “POSSIBLE				Refer to the Troubleshooting and Repair
AREAS OF MISADJUSTMENT(S)” lists the				Table of Contents to locate each specific
obvious external possibilities that may con-				Test Procedure. All of the specified test
tribute to the machine symptom.			Perform	points, components, terminal strips, etc. can
these tests/checks in the order			listed. In	be found on the referenced electrical wiring
general, these tests can be conducted with-				diagrams and schematics. Refer to the
out removing the case wrap-around cover.				Electrical Diagrams Section Table of
				Contents to locate the appropriate diagram.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

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CLASSIC® 300D & 300G