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TROUBLESHOOTING & REPAIR |
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TROUBLESHOOTING GUIDE |
| Observe Safety Guidelines | |||||||||
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| detailed in the beginning of this manual. | |||
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| PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED | |||||||
| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| STICK WELDING PROBLEMS |
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| Stick electrode “Blasts Off” when |
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| 1. Weld current is set too high |
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| 1. | Possible faulty SCR bridge. |
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| arc is struck. |
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| for recommended electrode |
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| See Static and Active SCR |
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| size. Reduce preset current |
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| Tests. |
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| adjustment. |
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| 2. | Control board may be faulty. |
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| Replace. |
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| Cannot adjust AC Wave Balance |
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| 1. This is a normal condition. |
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| None |
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| when welding in the Stick Mode. |
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| Wave balance keys are |
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| automatically disabled in the |
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| Stick Mode. |
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| Machine welds at a very low output |
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| 1. If welding in the Remote |
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| 1. | Check the SCR bridge. See |
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| Control Mode, the remote |
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| Static and Active SCR Tests. |
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| ting - arc is stable. |
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| amptrol may be defective or |
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| not installed properly. |
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| 2. | Check polarity switch (S2) |
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| 2. If the output is low when the |
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| connections and operation. |
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| machine is in the Local |
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| 3. | Check the control transformer |
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| Control Mode, the problem |
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| (T2). See Control Transformer |
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| could be internal to the |
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| Voltage Test. |
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| machine. |
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| 4. | The Control board may be |
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| faulty. Replace. |
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| Variable or sluggish welding arc |
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| 1. Check work and electrode |
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| 1. | Check polarity switch (S2) for |
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| when welding in the Stick Mode. |
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| cables for loose or poor |
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| wear or loose connentions. |
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| connections. |
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| 2. The weld cables may be too |
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| 2. | Check interior connections of |
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| the heavy current carrying |
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| small or too long to permit the |
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| leads. |
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| desired current to flow. |
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| 3. The preset current adjustment |
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| may be set too low. |
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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
