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| TROUBLESHOOTING & REPAIR |
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| TROUBLESHOOTING GUIDE | Observe Safety Guidelines | |
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| detailed in the beginning of this manual. | |
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED | ||
(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | ||
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| OUTPUT PROBLEMS |
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Major physical or electrical dam- | 1. | Contact your local authorized | 1. | Contact the Lincoln Electric |
age is evident when the sheet |
| Lincoln Electric Field Service |
| Service Department, |
metal cover(s) are removed. |
| Facility for technical assis- |
| 2531 or |
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| tance. |
| (WELD). |
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Machine is dead – no output – no | 1. | Check the input voltage at the | 1. | If when the “start” button is |
fans – no displays. |
| machine. Input voltage must |
| pushed the pilot light is lit and |
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| match the rating plate and the |
| the input contactor (CR1) acti- |
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| reconnect panel. |
| vates, check the wiring at the |
| 2. Check for blown or missing |
| reconnect panel and also to | |
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| the main transformer primary | ||
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| fuses in the input lines. |
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| coils. | |
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| 3. Check for a blown or missing | 2. Perform the Input Contactor | ||
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| control circuit fuse F1. | ||
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| Test. | |
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| 4. | The machine secondary | 3. Perform the Main Transformer | |
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| thermostat may be open. | ||
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| Test. | |
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| Allow machine to cool. |
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| 4. If when the “start” button is | |
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| pushed the pilot light does |
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| NOT light and the input con- |
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| tactor does NOT activate, |
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| check the start/stop button for |
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| proper operation. |
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| 5. Perform the Pilot Transformer | |
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| Test. |
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| 6. If when the “start” button is | |
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| pushed the pilot light is lit and |
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| the input contactor does NOT |
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| activate, perform the Input |
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| Contactor Test. |
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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, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
SQUARE WAVE TIG 355
