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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE | |||||||||
| detailed in the beginning of this manual. |
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| PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| TIG MODE PROBLEMS |
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| Machine output is intermittently |
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| 1. Problem may be caused by |
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| 1. | Internal ground connections |
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| lost. Gas flow and high frequency |
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| high frequency interference. |
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| may be loose. Check mounting |
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| are also interrupted. |
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| Make sure that the machine is |
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| screws on the Protection/ |
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| grounded properly according |
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| Snubber board and also on the |
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| to the installation instructions. |
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| Bypass board. All case screws |
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| If there are other high |
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| should be in place and tight. |
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| frequency sources in the area, |
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| 2. | Protection/Snubber board may |
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| make certain that they are |
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| grounded properly. |
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| be faulty. See Protection/ |
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| Snubber Board Continuity Test. |
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| 2. Check arc start switch or |
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| 3. | Check trigger circuit. See Arc |
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| amptrol for proper operation |
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| and loose connections. |
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| Start Trigger Circuit Test. |
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| Arc “Flutters” when TIG welding. |
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| 1. Tungsten electrode may be |
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| 1. | Check for loose shunt connec- |
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| too large in diameter. |
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| tions.- leads #221 and #222. |
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| Refer to wiring diagram. |
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| 2. Tungsten not “Sharp” when |
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| 2. | Check polarity switch for loose |
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| welding in DC negative mode. |
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| or faulty connections. |
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| 3. If helium is used as a |
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| 3. | SCR bridge may be faulty. See |
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| shielding gas, then reduce the |
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| percentage of helium. |
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| Static and Active SCR Tests. |
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| 4. Adjust flow rate of shielding |
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| 4. | Protection/Snubber board may |
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| gas. |
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| be faulty. See Protection/ |
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| Snubber Board Continuity Test. |
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| 5. Check hoses and connections |
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| 5. | Check R3, R4 and C2 in the |
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| for leaks. |
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| high voltage transformer prima- |
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| ry circuit. Refer to wiring dia- |
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| gram. |
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| 6. | The Control board may be |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call