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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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| FUNCTION PROBLEMS |
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When using Crater Fill the arc | 1. The Crater Fill % Peak Current | 1. Check the Crater Fill Fade Out |
goes out before the final crater fill | control may be set too low for | control potentiometer for cor- |
current level is reached. | the tungsten being used. | rect resistance and proper |
| Increase the Crater Fill % Peak | operation. |
| Current control until the final | 2. The control board may be |
| crater fill current is within the | |
| faulty. Replace. | |
| tungsten’s operating range. | |
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| |
| 2. If using the Pulser in conjunc- |
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| tion with the Crater Fill, the |
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| Background % Peak Current |
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| may be too low for the tung- |
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| sten as the current is |
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| downsloping in crater fill. The |
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| best solution is to increase the |
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| Background % Peak Current |
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| level. |
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| 3. If welding with AC, use |
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| “Continuous” high frequency. |
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| The high frequency will stabi- |
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| lize the arc as the current goes |
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| down. |
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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
