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6 , mains overvoltage detection circuit
When a voltage of +310 V causes rises , Tl transformer ( 7 ) out of the voltage induced foot rises , R3 share the voltage will also rise when the voltage rises to R3 chip ( 1 ) provided inside the foot when setting , overvoltage protection circuit operates , Ul stop vibration.
7 , how to determine whether a fault in the power supply board
The power board can be removed from the machine down, so it was easier to repair .
The power board solder side up , and put on the insulating desktop, be sure to pay attention to insulation.
With a wire to +5 v and CON3 connector ¢ß feet (ON / OFF) side shorted , you can turn on the power .
After connecting a dummy load , power testing with a multimeter +5 V (CON4 connector ( 1 ) a ( 2 ) feet ), +12 V (CON3 connectors ( 2 ) a ( 5 ) feet ), +24 V (CON2 connector ( 3 ) a ( 8 ) feet ) voltage is normal , if the voltage is not normal three groups can determine the fault in the power supply board, otherwise the system other circuit failure.
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