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| THEORY OF OPERATION |
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| Observe Safety Guidelines 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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| RED and GREEN LEDʼs are |
| OUTPUT PROBLEMS | 1. | Check all PC Board |
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| 1. | Control Board failure. |
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| always “ON” |
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| 2. | Connections. |
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| Replace Control Board. |
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| The machine welds but there is | 1. | Potentiometer failure. | 1. Potentiometer or Control |
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| no output control | 2. | The Shunt screw |
| Board needs Replaced. |
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| connections are bad. | 2. Tighten and check all shunt |
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| 3. | Inverter Board failure. |
| connections. |
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| 3. Perform Inverter Board |
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| Voltage Test. |
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| The machine does not have | 1. Loose connections on output | 1. | Check all secondary |
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| maximum output |
| secondary leads. | 2. | connections. |
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| 2. The Control Board is out of | Recalibrate the Control Board. |
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| Calibration. |
| Replace if needed. |
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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