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| TROUBLESHOOTING & REPAIR | ||
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| THERMAL FAN/SNUBBER BOARD LED CHART | |||
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| LED # |
| LED FUNCTIONS AND INDICATIONS |
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| (Machine is ON) |
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| 1 |
| Indicates fan should be running. |
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| 2 |
| Indicates welding current is greater than 200 amps. |
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| 3 |
| Indicates fan should be running due to heating of main |
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| SCRs. |
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| 4 |
| Indicates an open thermal fan thermistor or an open con- |
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| nection between the thermistor and the thermal fan/snub- |
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| ber board. See the Wiring Diagram (leads #319 and |
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| #316). |
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| 5 |
| Indicates a thermostat (choke or secondary) has opened. |
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| The thermal protection light should also be illuminated. |
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| 6 |
| Indicates the fan motor should be running. LED 6 should |
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| be illuminated and the fan running when any |
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| of the following LEDs are lit: LED 2, LED 3, LED 4, or |
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| LED 5. |
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