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F-2 TROUBLESHOOTING & REPAIRF-2
HOW TO USE TROUBLESHOOTING GUIDE
WARNING
Service and repair should be performed by only 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 malfunc- tions. Simply follow the
Step 1. LOCATE PROBLEM (SYMPTOM). Look under the column labeled “PROBLEM” (SYMP- TOMS). This column describes possible symp- toms that the machine may exhibit. Find the list- ing that best describes the symptom that the machine is exhibiting. Symptoms are grouped into four main categories: Output Problems, Function Problems, Cutting Problems and LED Function Problems.
Step 2. PERFORM EXTERNAL TESTS. The second column, labeled “POSSIBLE AREAS OF MISADJUSTMENT(S)”, lists the obvious external possibilities that may contribute to the machine symptom. Perform these tests/checks in the order listed. In general, these tests can be conducted without removing the case wrap- around cover.
Step 3. RECOMMENDED COURSE OF
ACTIONThe last column, labeled “Recommended Course of Action” lists the most likely components that may have failed in your machine. It also specifies the appropriate test procedure to verify that the sub- ject 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 referred to in the Troubleshooting Guide are described in detail at the end of this chapter. Refer to the Troubleshooting and Repair Table of Contents to locate each specific Test Procedure. All of the referred to test points, components, terminal strips, etc., can be found on the referenced elec- trical 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 test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before
you proceed. Call
HIGH VOLTAGE/ HIGH FREQUENCY can damage test equipment.
* Perform all voltage and wave form checks with high frequency circuit OFF. Perform High Frequency Disable Procedure.
PRECISION TIG 275
