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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) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| TIG WELDING PROBLEMS |
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| High frequency “spark” is present | 1. The spark gap may be too large. |
| 1. The | high voltage transformer | ||
| but weak. |
| Check and reset per instructions |
| (T2) may be faulty. |
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| this manual. |
| 2. Capacitor C6 may be faulty. | ||
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| in the Maintenance Section of |
| 3. The high frequency transformer | ||
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| 2. The work and/or torch cables |
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| may be in poor condition allow- |
| (T3) may be faulty. |
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| ing the high frequency to “leak” |
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| to ground. Use good quality |
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| cables, preferably those with a |
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| high natural rubber content and |
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| as short as possible. |
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| 3. If helium shielding gas is being |
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| used, reduce the percentage of |
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| helium. |
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| 4. Make sure the tungsten elec- |
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| trode is the correct size for the |
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| process. |
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| Poor arc starting in the | DC TIG | 1. The input line voltage may be |
| 1. Check the J11 plug on the con- | ||
| mode. |
| low. |
| trol board. See Wiring Diagram. | ||
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| 2. Check the torch and work cable |
| 2. Check the background resistor | ||
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| for loose or faulty connections. |
| R7. | Normal resistance | is 20 |
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| ohms. | diode | |
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| 3. Check the background | ||
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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