Panasonic KX-TG4011LAT Service Manual page 12

KX-TG4011LAT/KX-TG4012LAT/KX-TG4013LAT/KX-TGA403LAT
4.4.3. Power Supply Circuit/Reset Circuit
The power supply voltage from AC adaptor is converted to VBAT (3.0V) in IC302. And +3.0V for peripherals and analog part is
insulated from VBAT by Doubler of BBIC.
Circuit Operation:
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