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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 |
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(SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION | |||
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| OUTPUT PROBLEMS (Continued) |
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The output voltage and wire feed is | 1. | Remove the gun. If the problem | 1. | Check the machine's internal | ||
present continuously | or pulsing |
| is resolved the gun trigger circuit |
| trigger leads for grounds or | |
when gun trigger is NOT activated. |
| is faulty. Repair or replace. |
| shorts. See Wiring Diagram. | ||
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| 2. | If problem persists when gun | 2. | The control board may be faulty. | |
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| assembly is removed from |
| Replace. |
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| machine, then the problem is |
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| within the POWER MIG 255. |
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The output voltage is present contin- | Contact your local Lincoln Electric | 1. | Perform the SCR | Rectifier | ||
uously when gun trigger is NOT acti- | Authorized Field Service Facility. |
| Assembly Tests. |
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vated. |
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| 2. | The control board may be faulty. | |
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| 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