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F-1 TROUBLESHOOTING & REPAIR
HOW TO USE TROUBLESHOOTING GUIDE
WARNING
Service and Repair should 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 help you locate and repair possible machine malfunctions. Simply follow the
Step 1. LOCATE PROBLEM (SYMPTOM). Look under the column labeled “PROBLEM (SYMPTOMS)”. This column describes possible symptoms that the machine may exhibit. Find the listing that best describes the symptom that the machine is exhibiting. Symptoms are grouped into three main cat- egories: output problems, function prob- lems, welding problems.
Step 2. PERFORM EXTERNAL TESTS. The second column labeled “POSSIBLE AREAS OF MISADJUSTMENT(S)” lists the obvious external possibilities that may con- tribute to the machine symptom. Perform these tests/checks in the order listed. In general, these tests can be conducted with- out removing the case
Step 3. PERFORM COMPONENT TESTS. The last column labeled “Recommended Course of Action” lists the most likely com- ponents that may have failed in your machine. It also specifies the appropriate test procedure to verify that the subject component is either good or bad. If there are a number of possible components, check the components in the order listed to eliminate one possibility at a time until you locate the cause of your problem.
All of the referenced test procedures refered to in the Troubleshooting Guide are described in detail at the end of this chap- ter. Refer to the Troubleshooting and Repair Table of Contents to locate each specific Test Procedure. All of the specified test points, components, terminal strips, etc. can be found on the referenced electrical wiring diagrams and schematics. Refer to the Electrical Diagrams Section Table of Contents to locate the appropriate diagram.
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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
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CAUTION
If machine case sides and top are removed the case back and front must be sup- ported. Failure to do this could result in mechanical or electrical damage to the TIG 255. This is best accomplished with a wooden block. Refer to Figure F.3 as an example.
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CAUTION
HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
•Perform all voltage and waveform checks with high frequency circuit OFF.
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