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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
| TROUBLESHOOTING GUIDE |
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| detailed in the beginning of this manual. |
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| PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| WELDING PROBLEMS |
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| The welding arc is “cold.” The | 1. Check for loose or faulty con- | 1. Check for the correct OCV at |
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| engine runs normally. The auxiliary | nections at the weld output ter- | the welding output terminals. If |
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| power is normal. | minals and welding cable con- | the correct voltage is present at |
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| nections. | the output terminals, check for |
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| 2. The welding cables may be too | loose connections on the heavy |
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| current carrying leads inside the |
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| long or coiled, causing an |
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| Ranger | 250. See the Wiring |
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| excessive voltage drop. |
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| Diagram. |
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| 3. Make sure the electrode (wire, | 2. If the OCV is low at the welder |
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| gas, voltage, current etc.) is |
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| output | terminals, | perform the |
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| correct for the process being |
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| Engine | Throttle | Adjustment |
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| used. |
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| Test. |
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| 3. Perform the Output Rectifier |
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| Bridge Test. |
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| 4. Perform the Stator Voltage |
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| Test. |
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| 5. Perform the Power Module |
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| Test. |
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| 6. The Control Board may be |
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| faulty. |
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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
