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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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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 | 1. Check the welding cables for | 1. Check for loose or faulty con- | ||
output. The meters turn on, the | loose or faulty connections. | nections at the Control box, the | ||
input contactor activates and the |
| Chopper boards, | and the | |
Thermal light is off. |
| Analog Power Supply Board. | ||
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| See the Wiring Diagram. | ||
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| 2. Check the heavy current carry- | ||
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| ing leads at the choke, the | ||
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| chopper boards, the shunt and | ||
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| the output terminals for loose or | ||
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| faulty connections. | See the | |
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| Wiring Diagram. |
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| 3. Perform the Chopper Board | ||
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| Input Voltage and Resistance | ||
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| Test. |
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| 4. Perform the Analog Control | ||
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| Power Supply Board Test. | ||
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| 5. The Weld Control 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, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call