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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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| The machine output is intermit- | 1. | The problem may be caused | 1. | The machine internal ground |
| tently lost. Gas flow and high fre- |
| by high frequency inteference. |
| connections may be loose. |
| quency are also interrupted. |
| Make sure that the machine is |
| Check the mounting screws on |
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| grounded properly according |
| the protection board, the |
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| to the installation instructions. |
| bypass boards, and the feed- |
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| If there are other high frequen- |
| thru board. |
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| cy sources in the area, make | 2. The protection or bypass | |
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| certain they are grounded | ||
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| boards may be faulty. Check | |
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| properly. |
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| or replace. | |
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| 2. Check the Arc Start switch or | 3. Perform the Arc Start Trigger | ||
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| Amptrol for proper operation | ||
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| Circuit Test. | |
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| and loose connections. |
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| The arc “flutters” when TIG weld- | 1. | The tungsten electrode may be | 1. | Check for loose shunt connec- |
| ing. |
| too large in diameter. |
| tions, leads #222 and #221. |
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| 2. The tungsten electrode may |
| See Wiring Diagram. | |
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| needed sharpening. | 2. | Check polarity switch for loose |
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| 3. If helium shielding gas is used, |
| or faulty connections. | |
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| reduce the percentaghe of heli- | 3. | Perform the SCR Rectifier |
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| um. |
| Bridge Tests. |
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| 4. | Adjust the gas flow rate to the | 4. | Check components R6 and C6 |
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| proper level for the process |
| in the high voltage transformer |
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| being used. |
| primary circuit. Replace if nec- |
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| 5. Check gas hoses and connec- |
| essary. | |
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| tions for leaks. | 5. | The control board may be |
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| faulty. Replace. |
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| 6. The power board may be | |
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| 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
