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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) |
| MISADJUSTMENT(S) | COURSE OF ACTION | |||
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| OUTPUT PROBLEMS |
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| The machine does not have maxi- |
| 1. Make sure the correct three- | 1. Check the Output Control (R4). | |||
| mum output. |
| phase input voltage is being |
| Normal | resistance | is 10,000 |
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| applied to the machine. |
| ohms. | Also check | associated |
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| 2. If remote control is being used, |
| wiring for loose or faulty connec- | ||
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| tions. See the Wiring Diagram. | |||
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| set the Output Control switch |
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| (S2) to the “Machine or Local” | 2. | Check the Output Control switch | ||
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| position and control the weld |
| (S2) and associated wiring. See | ||
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| output with the machine Output |
| the Wiring Diagram. |
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| Control (R4). If the problem is | 3. | Perform the Main Transformer | ||
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| solved, check the remote control | ||||
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| Test. |
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| unit or wire feeder and associat- |
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| ed control cable. | 4. | Perform the SCR/Diode Bridge | ||
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| Rectifier Test. |
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| 5. The control board may be faulty. | |||
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| Replace. |
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| The machine will not shut off when |
| 1. Make sure the | 1. Check | the input power switch | ||
| the power switch is put in the OFF |
| lines are connected correctly to |
| (S1) and associated leads. See | ||
| position. |
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| the Wiring Diagram. |
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| 2. Perform the Input | Contactor | ||
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| Test. |
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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 216-
