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| TROUBLESHOOTING & REPAIR |
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| 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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Machine regularly | 1. Welding application may | 1. | One of the thermostats located |
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low light (LED) on the front panel | exceed recommended duty |
| on the output rectifier or FET |
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glows, indicating a thermal over- | cycle. |
| heat sink may be faulty. Test |
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load. The display is on. | 2. Dirt and dust may have |
| or replace. |
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| clogged the cooling channels |
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| inside the machine. Refer to |
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| the Maintenance Section of |
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| this manual. |
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| 3. Air intake and exhaust louvers |
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| may be blocked due to inade- |
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| quate clearance around |
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| machine. |
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| 4. Make sure both fans are func- |
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| tioning correctly. |
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Machine does not appear to over- | NONE | 1. | Check thermostats on output |
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heat, but yellow light turns on and |
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| rectifier and switch board #1. |
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off intermittently. Output is dis- |
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| These thermostats are normal- |
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abled whenever yellow light is on. |
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| ly closed. |
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| 2. Check leads from thermal |
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| switches to molex plug J23 on |
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| the control board for loose or |
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| faulty connections. |
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| 3. The control board may be |
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| faulty. Replace, and perform |
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| voltage calibration and current |
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| calibration procedures. |
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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-
