KX-NS5173XSX, KX-NS5174XSX - Panasonic PBX Service Manual (repair manual). Page 11

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KX-NS5173X/KX-NS5173SX/KX-NS5174X/KX-NS5174SX
5.2.11.
Power Supply Voltage Generator
The input from the main power supply is in 2 voltage levels: +3.3V, +40V.
Each required voltage levels are generated on board DC-DC converter.
Power supply block diagram is described as below figure.
DCDC
SLIC/CODEC
SLIC/CODEC
Vbat
DCDRV
SLT Power Supply
Bell Signal
MW
+3.3V
+40V Input
+3.3V Input
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