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TROUBLESHOOTING & REPAIR |
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Observe Safety Guidelines |
| 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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Major Physical or Electrical | 1. Contact your local Lincoln | 1. Contact The Lincoln Electric | ||||
Damage is Evident. | Authorized Field Service |
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| Facility. |
| (WELD). |
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No weld output and no auxiliary | 1. Check the brushes for wear and | 1. | Perform the Rotor Voltage Test. | |||
power. Engine runs normally. | proper contact to the rotor slip | 2. | Check | for the | presence of | |
| rings. | |||||
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| 12VDC (at the pc board) from | ||||
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| lead #216 to frame ground. This | |||
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| is the “flashing” voltage and is | |||
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| present only when the Start, | |||
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| Run, Stop switch S3 is in the | |||
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| “Start” position. If the 12 VDC is | |||
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| missing | check | the | leads, |
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| switches and connections asso- | |||
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| ciated with the lead #216. See | |||
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| Wiring Diagram. |
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| Check for the presence of 12 | |||
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| VDC (at the pc board) from lead | |||
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| #224 to frame ground. This is | |||
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| the supply voltage to the board | |||
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| and is present when the engine | |||
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| is running and the S3 switch is | |||
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| in the “Run” position. If the | |||
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| 12VDC is missing check the | |||
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| leads, switches and connec- | |||
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| tions associated with the lead | |||
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| #224. See Wiring Diagram. | |||
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| 3. If Rotor Voltage Test is normal, | ||||
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| then | preform | the | Rotor |
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| Resistance Test. |
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| 4. If the Rotor Voltage Test is NOT | ||||
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| normal, | perform | the | Auxiliary |
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| and Field Winding Voltage Test. | |||
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| Then check the Field Diode | |||
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| Bridge (D2) and the Field | |||
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| Capacitor (C1). Replace if nec- | |||
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| essary. If the Field Bridge and | |||
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| Field Capacitor are good, then | |||
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| the Printed Circuit Board may | |||
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| be 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