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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE | |||||||
| detailed in the beginning of this manual. |
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| PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED | |||||||
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| GAS FLOW PROBLEMS |
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| Low or no gas flow when gun |
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| 1. Check gas supply, flow regulator |
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| 1. Check for 115 vac at the gas |
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| trigger is pulled. Wire feed, weld |
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| and gas hoses. |
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| solenoid leads #7 to #32A. If the |
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| output and fan operate normally. |
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| correct voltage is present but |
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| 2. Check gun connection to |
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| the solenoid does not activate, |
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| machine for obstruction or leaky |
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| replace solenoid. See wiring dia- |
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| seals. |
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| 2. If voltage is not present at leads |
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| #7 to #32A, remove main supply |
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| power to machine. Test leads #7 |
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| and #32A for continuity (zero |
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| ohms) to the control board. |
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| 3. Control board may be faulty. |
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| Replace. |
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| PROBLEMS |
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| POSSIBLE AREAS OF |
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| RECOMMENDED | |||
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| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| WELDING PROBLEMS |
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| Arc is unstable – Poor starting |
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| 1. Check for correct input voltage |
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| 1. Check for correct open circuit |
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| to machine – 115 vac. |
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| voltage (OCV) at machine’s out- |
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| put terminals, 10 vdc to 28 vdc, |
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| 2. Check for proper electrode |
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| depending on arc voltage con- |
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| polarity for process. |
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| trol setting. If correct OCV is |
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| present check gun and work |
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| 3. Check gun tip for wear or dam- |
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| cable. |
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| age – Replace. |
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| 2. If OCV is low, check output |
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| 4. Check for proper gas and flow |
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| capacitor and output diodes. |
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| rate for process. |
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| 3. Check arc voltage control poten- |
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| 5. Check work cable for loose or |
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| tiometer and associated wires |
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| faulty connections. |
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| #205, #206 and #207 for loose |
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| or broken connections. See |
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| 6. Check gun for damage or |
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| wiring diagram. |
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| breaks. |
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| 4. Control board may be faulty. |
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| Replace. |
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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
