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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
| 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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| Wire feeds but welding output is | 1. Make sure that the proper wire |
| 1. Check for loose or faulty con- |
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| low causing wire to “stub”. Welds | and procedures are being used. |
| nections of the heavy current |
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| are “cold”. Machine cannot obtain |
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| carrying | leads. | See Wiring |
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| full rated output of 300 amps at 32 | 2. Check gun and work cable for |
| Diagram |
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| volts. | loose or faulty connections. |
| 2. Perform | the | Current |
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| Transducer Test. |
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| 3. Perform | Output | Waveform |
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| Test. |
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| 4. Perform the Output Rectifier |
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| Assembly Tests |
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| 5. The Control Board may be faulty. |
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| Replace. |
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| The output voltage and wire feed is | 1. Remove the gun. If the problem |
| 1. Find J85 on Feed Head Board |
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| present continuously or pulsing | is resolved, the gun trigger cir- |
| and unplug. If the problem still |
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| when gun trigger is NOT activated. | cuit is faulty. Repair or replace. |
| exist Feed Head Board may be |
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| faulty. |
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| 2. If problem persists when gun |
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| assembly is removed from |
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| machine, then the problem is |
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| within the POWER MIG 300. |
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| The output voltage is present con- |
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| 1. Find J6 on Control PCB and |
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| tinuously when gun trigger is NOT |
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| unplug. If output voltage is not |
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| activated. The wire is not feeding. |
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| present change Control PCB |
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| 2. Perform the Chopper Board |
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| 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, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
