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| TROUBLESHOOTING & REPAIR | |
| TROUBLESHOOTING GUIDE | Observe Safety Guidelines |
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| detailed in the beginning of this manual. |
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 (R1). | |||||||
mum output. |
| phase input voltage is being |
| Normal | resistance is | 10,000 | ||||
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| applied to the machine. |
| ohms. | Also check associated | |||||
| 2. | Make certain the Dial | Control |
| wiring for loose or faulty con- | |||||
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| Switch (SW3) is in the correct |
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| Diagram. |
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| position. (Not present on R3R |
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| 300). |
| 2. | Check | the | Ouptut |
| Control | |
| 3. | If the remote control | is being |
| Switch | (S2) | and | associated | ||
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| wiring. See the Wiring Diagram. | ||||||||
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| used, set the Output Control |
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| Switch (SW2) to the Machine or | 3. | Perform the Main Transformer | ||||||
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| Local position and control the |
| Test. |
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| weld output with the machine | 4. | Perform | the | SCR/Diode | ||||
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| Output Control (R1). | If the | |||||||
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| Bridge Rectifier Test. |
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| problem is resolved, check the |
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| remote control unit and associ- | 5. | If the Pocket Amptrol | is not | |||||
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| ated cable leads. If the Pocket |
| functioning | properly, | perform | ||||
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| Amptrol option is being used, |
| the Pocket | Amptrol |
| Circuit | |||
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| the Pocket Amptrol circuit may |
| Test. |
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| be faulty. |
| 6. | The control | board | may be | |||
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| faulty. 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 |
| input lines are connected cor- |
| (S1) and associated leads. See | ||||||
position. |
| rectly to the R3R machine. |
| 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
