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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 |
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Machine welds at a very low output 1. | If welding in the TIG mode the | 1. | Check the polarity switch and |
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regardless of the current control set- | remote control device may be |
| associated leads. |
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ting. |
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| defective. |
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| 2. | Check the interior connections of | |
| 2. | Make certain the input line volt- |
| the heavy current carrying leads. | ||
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| age is correct for the machine |
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| reconnect configuration. | 3. | Perform the SCR Bridge Test. | |
| 3. | Check the welding cables and or | 4. | Perform the T1 Transformer |
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| torch for loose or faulty connec- |
| Test. |
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| tions. |
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| 5. | Check the current control for |
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| proper operation. Normal resis- | |
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| tance is 10k ohms. See wiring |
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| diagram. |
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| 6. The control board may be faulty. | ||
The machine welds at a very high | 1. If welding in the TIG mode the | 1. | Perform the SCR Bridge Test. |
output regardless of the current con- | remote control device may be |
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trol setting. | defective. | 2. | Perform the T1 Transformer |
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| Test. |
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| 3. | Check the current control for |
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| proper operation. Normal resis- |
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| tance is 10k ohms. See wiring |
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| diagram. |
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| 4. | The control board may be faulty. |
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