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| 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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| OUTPUT PROBLEMS |
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The machine has welding output | 1. Check the output control switch | 1. | The output control potentiome- | ||||||
but no control. | (SW3) for proper setting. |
| ter, output control switch (SW3) | ||||||
| 2. If a | remote | control | cable is |
| or associated | wiring | may be | |
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| defective. | See the Wiring | ||||||
| used, | make | certain | the cable |
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| Diagram. |
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| and connections are good. |
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| 2. Perform the Firing Board Test. | ||||
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| 3. | Perform the | SCR | Output | |
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| Bridge Test. |
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| 4. The control |
| board | may be | |
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| faulty. See the Control Board | |||
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| LED Chart. |
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The machine does not have maxi- | 1. Check the | 1. | The output control potentiome- | ||||||
mum output. | lines at the | Make cer- |
| ter, output control switch (SW3) | |||||
| tain the input voltages match |
| or associated wiring may be | ||||||
| the machine’s rating and recon- |
| defective. | See the Wiring | |||||
| nect panel configuration. |
| Diagram. |
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| 2. Put the output control switch | 2. | Perform the Main Transformer | ||||||
| (SW3) in the “Local” control |
| Test. |
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| position. If | the problem is | 3. Perform the Firing Board Test. | ||||||
| resolved, the remote unit or | ||||||||
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| wire feeder may be defective. | 4. | Perform the SCR Bridge Test. | ||||||
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| 5. The control |
| board | may be | |
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| faulty. See the Control Board | |||
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| LED Chart. |
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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
