I came across this circuit in pioneer brand vsx522 model amplifier circuit diagram. This supposed to initialize the microcontroller during AC power up.
But it looks like wrongly drawn. The resistor on the left is directly connected to the 3.3V linear regulator which is powered by a tiny mains 240V 50 Hz standby transformer. The output of this circuit, at least in my perception, is used to initialize the micro controller and it looks like will locked up at high state (3.3V) indefinitely. The transistor and everything else around it cannot pull the RESET to low.
Am I right? Or do I miss anything? The values of components are not fully specified.