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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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| TIG MODE PROBLEMS |
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No high frequency. Machine is in | 1. In order for the high frequency | 1. | Check the high voltage trans- |
TIG Mode and has normal output. | to operate, the machine must |
| former (T3). The normal resis- |
| be either in Start Only mode or |
| tance of the secondary wind- |
| Continuous High Frequency |
| ing is 12.5 |
| mode. |
| 115VAC is applied to the pri- |
| 2. The high frequency spark gap |
| mary of T3. A very high volt- |
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| age is developed on the sec- | |
| may be too large or shorted. |
| |
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| ondary winding. For assis- | |
| Check the gap per mainte- |
| |
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| tance call the Lincoln Electric | |
| nance instructions. |
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| Service Dept., (216) | |
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| or |
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| 2. | Check the values of R6 and |
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| C6. Replace if necessary. |
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| 3. | Check the continuity of coils |
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| L4 and L5. Normal resistance |
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| is approximately 10 ohms. |
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| 4. | Perform the Feed – Thru |
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| Board Test. |
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| 5. | Perform the Control Board |
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| High Frequency Signal Test. |
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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
