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| TROUBLESHOOTING & REPAIR |
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| 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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| TIG MODE PROBLEMS |
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Open circuit voltage is present at | 1. | The Arc Start switch or | 1. | Check the trigger circuit. |
the output terminals even when |
| Amptrol may be defective. |
| Perform the Arc Start Trigger |
the Arc Start switch or Amptrol is |
| There should not be any conti- |
| Circuit Test. |
NOT actuated. |
| nuity between pins “D” and “E” | 2. The control board may be | |
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| on the Arc Start cable connec- | ||
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| faulty. Replace. | |
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| tor, unless the unit is actuated. |
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| 3. The power board may be | |
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| faulty. Replace. |
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Arc rectification when AC TIG | 1. | The tungsten electrode may be | 1. | Check components R6 and C6 |
welding. |
| too small for the process. |
| in the high voltage transformer |
| 2. The AC Wave Balance control |
| primary circuit. Replace if nec- | |
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| essary. | ||
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| may be misadjusted. Adjust |
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| for more penetration. | 2. | Perform the SCR Rectifier |
| 3. If helium shielding gas is being |
| Bridge Tests. | |
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| used, reduce the percentage of | 3. | The control board may be |
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| helium. |
| faulty. 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
SQUARE WAVE TIG 355
