The +48V Supply.
Max current rating is 0.3 Amps. The +48V phantom supply is based on the
The TL783C maintains a fixed 1.27 V between its ADJ and OUT pins, so the adjustable
An output current of 0.5A and a wide
Two protection diodes are included. D1 protects the regulator from reverse voltage if there is a charged capacitor across the output but the voltage on C1,24 has collapsed. D2 prevents the ADJ pin from rising above the OUT pin (due to the charge on C2) if the output is shorted.
Conventional diode D6 on the output allows supplies to be paralleled for redundancy.
The +8V Supply.
Max current rating 1.25 Amps. This supply is primarily intended for powering console internal computers; it will be regulated down to +5V inside the console.
The AC input is fused by F4 and fullwave rectified by BR4. The unregulated DC is about +15V on nominal mains. The LM317T regulator maintains a fixed 1.25V between its ADJ and OUT pins, so fixed
Two protection diodes are included. D9 protects the regulator from reverse voltage if there is a charged capacitor across the output but the voltage on C20,21 has collapsed. D10 prevents the ADJ pin from rising above the OUT pin (due to the charge on C23) if the output is shorted.
Conventional diode D11 on the output allows supplies to be paralleled for redundancy.
Mains Voltage Select PCB. SC3817
This PCB (SC3817) carries the inrush suppressor and two DPCO switches that select the transformer primary connections to suit the incoming mains voltage.
The first switch A selects between EUROPE and USA/JAPAN settings. The second switch B selects high and low variations on this:
Mains | Mains | Nominal | Dropout | Dropout |
Switch A | Switch B | Mains | Voltage | Voltage |
20 | Circuit Description |