Measuring voltage power rectifier filter and +300 V + B voltage is normal. A control circuit failure may be caused. Measuring instantaneous power +5 V remote power, found that the voltage is only 1.4V or so, and gradually decreased down to 0.3V. Then check the circuit VD885 positive and negative resistance, the result difference is small. After replacing VD885 +5 V voltage returns to normal, troubleshooting.P8Yservice manual download site