KX-NS520RU (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 13

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Fig.6 shows power circuit diagram of NS520.
In AC/DC convert blotck, AC input voltage is converted to DC+15V and DC+41V. DC+15V/+41V is distributed to each card.

Base

Trunk#2

MPR/SPR

DSP

RMT

EXP-M

AC/DC

FG Plate

+41 V

+15 V

15V/3.3V

Extension#2

Extension#1

Trunk#1

15V/3.3V

15V/5V

PMIC

15V/5V

USB

Fig.6 Power Circuit Block Diagram