| TROUBLESHOOTING & REPAIR | |
| TROUBLESHOOTING GUIDE | Observe Safety Guidelines |
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| detailed in the beginning of this manual. |
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| CUTTING PROBLEMS |
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The pilot arc is normal, but the arc | 1. Make sure the operating proce- | 1. | Check the lead connections X2, | ||||
will not transfer to the workpiece. | dure is correct for the process. |
| X4 and B21 at the output board. | ||||
| See the Operation section of | 2. | Check | the | output | control | |
| this manual. | ||||||
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| potentiometer (R1). | Normal | ||||
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| 2. Make sure the work clamp is |
| resistance is | 10 ohms. | Also | ||
| connected tightly to the work- |
| check the associated leads for | ||||
| piece. |
| loose or faulty connections to | ||||
| 3. The workpiece must be electri- |
| the display | board. See | the | ||
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| Wiring Diagram. |
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| cally conductive material. |
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| 3. | Check leads #216, #218 and | ||||
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| #219 between the | display | |||
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| board and the control board. | ||||
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| Check for loose or faulty con- | ||||
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| nections. | See the | Wiring | ||
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| Diagram. |
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| 4. | The control board may be | ||||
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| faulty. Replace. |
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| 5. | The output board may be faulty. | ||||
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| Perform | the | Output | Board | |
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| Resistance Test. |
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| 6. | The display board may be | ||||
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| faulty. Replace. |
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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
