KX-NS5171XSX, KX-NS5172XSX - Panasonic PBX Service Manual (repair manual). Page 11

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KX-NS5171X/KX-NS5171SX/KX-NS5172X/KX-NS5172SX
5.2.3.
Power Supply Circuit
The input from the main power supply is in 2 voltage levels: +3.3V, +40V.
Power supply block diagram is described as below figure.
+40V Input
+3.3V Input
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