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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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| OUTPUT PROBLEMS |
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| The machine has minimum (or very | 1. Make certain the | 1. | Check the Output Control (R1) | ||||||||
| low) welding output and no con- | input voltage is correct and |
| and associated wiring. See the | ||||||||
| trol. | matches the rating plate and |
| Wiring Diagram. |
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| the reconnect panel. |
| 2. Check the Output Control | ||||||||
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| 2. Make certain the Dial Control |
| Switch | (S2) | and | associated | |||||
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| Switch (SW3) is in the correct |
| wiring. | See | the | Wiring | |||||
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| position. | (Not present on R3R |
| Diagram. |
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| 300). |
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| 3. Perform the Main Transformer | ||||||
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| 3. If the remote control is being |
| Test. |
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| used, set the Output | Control | 4. | Perform | the | SCR/Diode | |||||
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| Switch (SW2) to the Machine or | ||||||||||
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| Rectifier Bridge Test. |
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| Local position and control the |
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| weld output with the machine | 5. If the Pocket Amptrol is not | |||||||||
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| Output Control (R1). | If the |
| functioning | properly, | perform | |||||
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| problem is resolved, check the |
| the Pocket | Amptrol | Circuit | ||||||
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| remote control unit and associ- |
| Test. |
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| ated cable leads. If the Pocket | 6. | The control | board | may be | ||||||
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| Amptrol option is being used, | ||||||||||
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| faulty. Replace. |
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| the Pocket Amptrol circuit may |
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| be faulty. |
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| 4. Make sure the remote control |
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| leads (#75, #76, #77) are not |
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| grounded or shorted to the |
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| positive | or negative | welding |
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| output. |
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| The input contactor operates - the | 1. Make certain the output control | 1. | Check for loose or faulty con- | ||||||||
| fan runs - the pilot light is on - but | switch (SW2) is in the Machine |
| nections on the heavy current | ||||||||
| the machine has no welding out- | or Local position. | If the prob- |
| carrying leads between the out- | |||||||
| put. The open circuit voltage is not | lem is resolved, check the |
| put terminals, the shunt, the | ||||||||
| present at the output terminals. | remote control and associated |
| choke | and | the | SRC/Diode | |||||
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| circuitry. | See | the | Wiring |
| Bridge. | See | the | Wiring | ||
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| Diagram. |
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| Diagram. |
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| 2. | Perform | the | SCR/Diode | |||
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| Rectifier Bridge Test. |
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| 3. Perform the Main Transformer | ||||||
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| 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 test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
