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TROUBLESHOOTING & REPAIR | ||||
TROUBLESHOOTING GUIDE |
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| Observe Safety Guidelines | |
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| detailed in the beginning of this manual. | |
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PROBLEMS |
| POSSIBLE AREAS OF |
| RECOMMENDED |
(SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| WELDING PROBLEMS |
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The welding arc is “cold.” The |
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| 11. Check for poor connection at |
engine runs normally. The auxiliary |
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| J21 pins 1 & 4 at the CV daugh- |
power is normal. (Continued) |
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| ter board. This is CVSCR gate |
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| drive output. Will not affect |
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| welding in the general fab or |
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| pipe taps. |
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| 12. Check for poor connection |
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| along lead #208 at the negative |
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| CV output stud and at J21 pin 6 |
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| molex plug at the CV daughter |
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| board. This is CV voltage feed- |
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| back input. Will not affect weld- |
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| ing in the general fab or pipe |
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| taps. |
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| 13. Check the weld & CV chokes (if |
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| so equipped) for turn to turn |
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| shorts. |
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| 14. Check all waveforms as illus- |
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| trated in the Oscilloscope |
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| Waveforms Section. |
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| 15. Perform the Control Board |
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| Power Supply Test. |
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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 1-
