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| TROUBLESHOOTING & REPAIR |
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| 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 | |||||||
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| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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| 115VAC Receptacle not working |
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| 1. Check for 115VAC at |
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| 1. If voltage at the receptacle is |
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| properly (voltage is below 108VAC). |
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| receptacle - if low (below |
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| zero, then check for open cir- |
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| Machine has welding output - fan is |
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| 108VAC), then check input |
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| cuit breaker (CB1) |
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| running. |
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| voltage to machine. |
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| 2. Check leads #230, #231, and |
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| #232 for loose or broken con- |
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| nections. Refer to wiring dia- |
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| gram. |
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| Machine regularly overheats - ther- |
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| 1. Welding application may |
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| 1. Check for proper fan operation. |
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| mostat opens, PL1 (yellow light on |
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| exceed recommended duty |
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| front panel) glows. The fan runs |
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| cycle. |
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| 2. The thermostat may be faulty - |
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| but machine has no output and no |
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| Should be normally closed |
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| display. |
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| 2. Dirt and dust may have |
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| clogged the cooling channels |
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| inside the machine. Blow out |
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| unit with clean, dry |
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| compressed air. |
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| 3. Air intake and exhaust louvers |
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| may be blocked due to |
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| inadequate clearance around |
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| machine. |
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| Machine makes a very loud |
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| 1. Inspect output stud insulators |
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| 1. Diode (D1) may be shorted. |
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| buzzing noise in DC Stick Mode, or |
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| for cracks or signs of over- |
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| Check and replace if neces- |
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| in DC TIG Mode when the arc start |
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| heating. |
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| sary. |
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| or amptrol is pressed. |
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| There is no current draw from |
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| 2. The SCR bridge may be faulty. |
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| See Static and Active SCR |
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| machine’s output studs. |
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| Tests. |
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| (The machine is not externally |
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| loaded). |
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| 3. Check the polarity switch (S2) |
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| for correct connections. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call
