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| TROUBLESHOOTING & REPAIR |
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TROUBLESHOOTING GUIDE |
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| Observe Safety Guidelines | |||||||||
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| 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 WELDING PROBLEMS |
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| High frequency “Spark” is present |
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| 1. | Torch may be faulty. |
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| This may be a welding procedure |
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| at tungsten electrode, but operator |
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| problem. |
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| is unable to establish a welding arc. |
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| 2. If an amptrol is not being used, |
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| Machine has normal open circuit |
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| then the machine must be in |
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| Contact The Lincoln Electric |
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| voltage (approximately 53V). |
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| the Local Control Mode. |
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| Service Department (216) 383- |
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| 3. Tungsten electrode may be |
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| 2531 or |
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| too large for the process. |
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| 4. If helium shielding gas is being |
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| used, then reduce percentage |
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| of helium. |
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| 5. If TIG welding in the DC |
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| negative mode, then a properly |
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| sharpened thoriated tungsten |
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| should be used. |
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| 6. Check the welding cables and |
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| output stud connections. |
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| No high frequency. Machine is |
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| 1. | In order for the high frequency |
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| 1. Check the high voltage trans- |
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| in the TIG Mode and has normal |
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| to operate, the machine must |
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| former (T3). The normal resis- |
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| output. |
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| be either in the start only |
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| tance of the secondary winding |
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| Mode or the continuous high |
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| of the high voltage transformer |
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| frequency mode. |
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| is 12.5k ohms. 115vac is |
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| 2. The high frequency spark gap |
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| applied to the primary of T3. A |
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| very high voltage is developed |
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| may be too large or shorted. |
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| on the secondary winding. For |
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| Check gap as per |
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| assistance call The Lincoln |
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| maintenance instructions. |
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| Electric Service Department. |
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| (216) |
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| 9353 (WELD). |
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| 2. Check the values of R3, R4 |
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| and C2. Replace if faulty. |
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| 3. The Protection/Snubber board |
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| may be faulty. See |
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| Protection/Snubber Board |
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| Continuity Test. |
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| 4. The Control 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 tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call