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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. | |
OUTPUT PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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Major physical or electrical dam- | 1. Contact the Lincoln Electric | 1. | Contact the Lincoln Electric |
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age is evident. | Service Dept. |
| Service Dept. |
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Machine | 1. Check for blown or missing | 1. | The ON/OFF switch may be |
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the input contactor does not oper- | fuses in the input lines. |
| faulty. Check switch and asso- |
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ate. The white power light is NOT | 2. Check the three phase input line |
| ciated leads. See the Wiring |
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lit. |
| Diagram. |
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voltage at the |
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| The input voltage must match | 2. | The thermostat, located on the |
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| the rating plate and reconnect |
| rear of the main transformer |
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| panel. |
| iron, may be faulty. This is nor- |
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| mally a closed device. |
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| 3. | The control box diode bridge |
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| may be faulty. Also check |
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| associated wiring for loose or |
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| faulty connections. See the |
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| Wiring Diagram. |
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| 4. | Perform the T2 Control |
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| Transformer Test. |
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| 5. | Perform the Control Board |
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| Test. |
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The input contactor does not oper- | 1. Check the three phase input line | 1. | Perform the Input Contactor |
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ate. The white power light is ON. |
| Test. |
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voltage at the |
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| The input line voltage must | 2. | Check leads #240 and #241 |
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| match the rating plate and |
| between the control board and |
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| reconnect panel. |
| the input contactor for loose or |
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| 2. Turn the power switch OFF and |
| faulty connections. See the |
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| Wiring Diagram. |
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| wait a few seconds. Turn the |
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| power switch back ON. If the | 3. | Perform the Control Board |
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| problem is not resolved, contin- |
| Test. |
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| ue with the “Recommended | 4. | Perform the SCR Rectifier |
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| Courses of Action”. |
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| Bridge 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 1-
