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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE |
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| 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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| Major physical or electrical damage | 1. Contact your local | Lincoln | 1. Contact the Lincoln Electric |
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| is evident. | Authorized Field | Service | Service Department, |
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| Facility. |
| 3877. |
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Machine has no open circuit volt- | 1. Check | the | control | cable | 1. | Perform | the | T1 | Auxiliary | ||||||
age. Wire feeds OK. |
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| between | the | feeder | and | the |
| Transformer Test. |
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| STT unit. Make sure the #2 and | 2. | Perform | the | T4 | Auxiliary | |||||||
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| #4 leads are intact. |
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| Transformer Test. |
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| 2. Put a jumper wire between Pins | 3. Perform the Power Board Test. | |||||||||||||
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| "C" and "D" on the 14 pin | ||||||||||||
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| amphenol. If normal open cir- | 4. | Perform | the | Trigger | Circuit | |||||||
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| cuit voltage | (85VDC) | is |
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| restored, the problem is in the | 5. | Perform | Capacitor | Balance | ||||||||
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| feeder. |
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| 3. Make sure the reconnect switch | 6. Perform the Protection Board | |||||||||||||
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| the | 7. | Perform | the | Switch | Board | |||||||
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| Test. |
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| 8. Check for loose or broken con- | |||||
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| CAUTION |
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| nections on the heavy current | |||||||
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| carrying | conductors | (i.e., main | ||
| Do not switch reconnect switch |
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| transformer, | choke, | output | |||||||||||
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| diodes, IGBT module and out- | ||||||||||||
| machine. |
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| put terminals). |
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| 9. The control PC 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
