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| TROUBLESHOOTING & REPAIR |
| |
| TROUBLESHOOTING GUIDE | Observe Safety Guidelines | |
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| detailed in the beginning of this manual. | |
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED | ||
(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | ||
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| OUTPUT PROBLEMS |
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The machine shuts off (pilot light | 1. The input voltage may be too | 1. | Perform the SCR Bridge Test. | |
goes out and the fans stop) when | high (more than 10% over | 2. | Perform the Power Board | |
the Arc Start Switch or Amptrol is | rated). | |||
| Test. | |||
activated. |
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2. The Arc Start switch may be |
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| 3. | Perform the Control Board | ||
| faulty. Check or replace. | |||
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| Test. | ||
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| 4. | Shunt may be faulty or over- | |
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| heated. Check for loose con- | |
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| nections and replace shunt if | |
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| necessary. | |
The 115VAC receptacle does not | 1. | The circuit breaker CB1 may | 1. | The circuit breaker may be |
work. The machine operates nor- |
| have opened. Reset if neces- |
| faulty. Test or replace. |
mally. |
| sary. | 2. | If the fans are running, check |
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| 2. | Check for the presence of |
| the receptacle and the associ- |
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| 115VAC at the receptacle. |
| ated wiring. |
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
SQUARE WAVE TIG 355
