Panasonic KX-TC1872B Service Manual page 57

KX-TC1868B / KX-TC1871B / KX-TC1872B
13.17. Initializing Circuit
Function:
This circuit is used for to initialize the microcomputer when it incorporates an AC adaptor.
Circuit Operation:
When the AC Adaptor is inserted into the unit, then the voltage is shifted by IC301, D306 and power is supplied to the DSP.
The set can operate beyond point A in the circuit voltage diagram.
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