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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 welding output | 1. | If a remote control unit is NOT | 1. | If the machine operates normal- |
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| but no control of output. The auxil- |
| connected to | the | machine, |
| ly in the “LOCAL” position but |
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| iary power is normal. |
| make sure | the | LOCAL/ |
| not in the “remote” position, per- | |
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| REMOTE switch is in the |
| form the RF Bypass Board | |||
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| “LOCAL” position. |
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| Resistance Test. | ||
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| 2. | If a remote control unit IS con- | 2. | Check the Remote/Local switch | |||
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| nected and the machine oper- |
| and associated wiring. See the | |||
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| ates normally when the switch is |
| Wiring Diagram. (leads #75, | |||
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| in the “Local” position, the |
| #76 and #77) | |||
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| remote control cable or unit may | 3. | Perform the Power Module | |||
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| be faulty. Check or replace. | |||||
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| Test. | ||||
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| 4. Perform the Control Input Test. | ||
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| 5. Perform the Feedback Input | ||
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| Test. | |
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| 6. Perform the PWM Output Test. | ||
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| 7. The Control Board may be faulty. | ||
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| The machine has low welding out- | 1. Check the brushes for wear and | 1. | If the engine high idle speed is | ||||
| put and low auxiliary output. |
| proper contact to the slip rings. |
| low, perform the Throttle Ad- | |||
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| 2. The engine RPM may be low. |
| justment Test. | ||||
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| 2. Perform the Rotor Resistance | ||
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| Test. | |
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| 3. Perform the Rotor Voltage | ||
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| Test. If the rotor voltage is low, | |
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| the field capacitor or field bridge | |
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| may be faulty. Test and replace | |
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| if necessary. See the Wiring | |
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| Diagram. | |
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| 4. If the engine high idle RPM is | ||
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| OK, then the engine may have | |
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| lost horsepower and be in need | |
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| of major repair. | |
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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, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
