Panasonic KX-TGP500B04 Service Manual page 15

4.6.5. Reset Circuit
Function:
This circuit is used 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 IC303 and power is supplied to the DSP.
The set starts to operate when VCC goes up to 3.3 V or more in the circuit voltage diagram.
Note:
• Refer to Circuit Board (Base Unit_Main) (P.113).
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KX-TGP500B04/KX-TPA50B04