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TROUBLESHOOTING & REPAIR | |||||||
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 |
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(SYMPTOMS) | MISADJUSTMENT(S) |
| COURSE OF ACTION | ||||
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| WELDING PROBLEMS |
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Poor arc characteristics. | 1. | Make sure the correct weld pro- | 1. Check the output capacitors and | ||||
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| cedures | are | being | used. | connections. A capacitor failure | |
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| is indicated if the small vent plug | ||
| 2. | Check the | welding | cables for | on top of a capacitor is raised or | ||
| blown out. | ||||||
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| loose or faulty connections. | |||||
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| WARNING: The liquid elec- |
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| trolyte in these capacitors is |
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| toxic. Avoid contact with any |
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| portion of your body. Clean |
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| up vented electrolyte using |
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| rubber gloves and a water |
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| dampened cloth. Any elec- |
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| trolyte which gets on skin, |
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| clean with soap and water. |
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| 2. The control board may be faulty. |
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Poor arc striking with semiautomat- | 1. | Make sure the correct weld pro- | 1. The control board may be faulty. | ||||
ic or automatic wire feeders. |
| cedures | are | being | used. |
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| (Electrode, Gas, etc.) |
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| 2. | Check the welding | cables for |
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| loose or faulty connections. |
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The welding arc is variable and | 1. Check the input voltage at the | 1. Perform the SCR/Diode Recti- | |||||
sluggish. |
| fier Bridge Test. | |||||
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| voltage and all three phases are | 2. Perform the Main Transformer | ||||
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| being applied to the machine. | |||||
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| Test. | |||||
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| 2. Make sure the welding process | 3. The control board may be faulty. | |||||
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| is correct for the machine set- | |||||
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| Replace. | |||||
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| tings. |
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| 3. Check the | welding | cables for |
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| loose or | faulty | connections. |
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| Also make sure cables are sized |
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| correctly for the welding current. |
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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
