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Return to Master TOC
Return to Master TOC
TROUBLESHOOTING & REPAIR |
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TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual | |||||||||||||
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PROBLEMS |
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| POSSIBLE AREAS OF |
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| RECOMMENDED |
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(SYMPTOMS) |
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| MISADJUSTMENTS(S) |
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| COURSE OF ACTION | |||||||
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| OUTPUT PROBLEMS |
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No Open Circuit Voltage output and | 1. | The thermostats may be open 1. | Check thermostats and associ- | ||||||||||
no wire feed when gun trigger is |
| due to machine overheating. If |
| ated leads for loose or broken | |||||||||
pulled. Display is functioning proper- |
| machine operates normally after |
| connections. |
| See | Wiring | ||||||
ly. |
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| a cooling off period then check |
| Diagram. |
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| for proper fan operation and |
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| ventilation. | Make certain that | 2. | Perform The | Main Transformer | ||||||
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| the machine's duty cycle is not |
| Test. |
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| being exceeded. |
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| 3. | The control board may be faulty. | ||||||
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| 2. | Check the gun trigger circuit. |
| Replace. |
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| Leads #324 to #325 should have |
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| continuity ( zero ohms) when the |
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| gun trigger is pulled. If not then |
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| the gun may be faulty - replace. |
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Wire feeds but welding output is low | 1. | If an error message is displayed | 1. | Check for loose or faulty con- | |||||||||
causing wire to "stub". |
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| on the display then proceed to |
| nections of the heavy current | ||||||||
Welds are "cold". Machine cannot |
| Explanation | of Prompting and |
| carrying leads. |
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obtain full rated output of 250 amps |
| Error Messages Section. |
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at 26 volts. |
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| 2. | The output capacitor bank may | ||||||
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| 2. | Make sure that the proper wire |
| be faulty. | Check for loose con- | |||||||
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| and procedures are being used. |
| nections at the capacitors. Also | ||||||||
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| check | for | leaky | capacitors. | |||
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| 3. | Check gun and work cable for |
| Replace if necessary. | WARN- | |||||||
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| loose or faulty connections. |
| ING: | The | liquid | electrolyte in | |||||
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| these capacitors is toxic. Avoid | ||||||
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| contact with any portion of your | ||||||
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| body. |
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| 3. | Perform | the | SCR | Rectifier | |||
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| Assembly Test. |
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4. Perform the Main Transformer
Test.
5. The control board may be faulty. Replace.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216-
