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TROUBLESHOOTING & REPAIR |
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Observe Safety Guidelines |
| TROUBLESHOOTING GUIDE | |||||
detailed in the beginning of this manual. |
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WELDING 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 machine does not have weld- | 1. Make sure the machine is prop- | 1. Check for output voltage feed- | |||||
ing output in the Stick mode. Zero | erly | back from the Output Filter | |||||
volts open circuit voltage. The | Stick mode. | Board. | See the Output Filter | ||||
Output LED on the control panel is |
| Board Test. |
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blinking. | The machine operates |
| 2. Check for output voltage feed- | ||||
correctly in the TIG mode |
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| back through the Bus Board. | ||||||
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| See the Bus Board Test. |
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| 3. The Control/Display Board may | ||||
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| be faulty. |
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The machine does not have weld- | 1. Make sure the correct input volt- | 1. The output rectifier | may | be | |||
ing output in either the Stick or TIG | age is applied to the machine. | faulty. Check and replace if nec- | |||||
modes. | Zero volts open circuit. | 230 or 115VAC. | essary. | See the | Secondary | ||
The Output LED on the control |
| Power Board Test and Wiring | |||||
panel is blinking. |
| Diagram. |
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| 2. The Output Clamp Board may be | ||||
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| faulty. |
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| 3. The Output Module Transistor | ||||
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| Board may be faulty. See the | ||||
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| Secondary Power Board Test | ||||
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| and Wiring Diagram. |
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| 4. Perform the Main IGBT Inverter | ||||
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| Board | Welding | Logic | and | |
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| Inverter Test. |
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| 5. The Superimposition Board may | ||||
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| be faulty. |
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| 6. The Hall Effect device may be | ||||
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| faulty. |
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| 7. The Control/Display Board may | ||||
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| be faulty. |
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The machine operates properly in | 1. Make sure the machine is | 1. The Output Module | Transistor | ||||
the Stick and DC TIG modes. AC | and configured correctly for the | Board may be faulty. | See the | ||||
TIG mode does not function prop- | AC TIG mode. | Secondary Power Board Test | |||||
erly. |
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| and Wiring Diagram. |
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| 2. The Superimposition Board may | ||||
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| be 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, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
