Panasonic KX-TD7685 - Wireless Digital Phone, Service Manual

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KX-TD7685
4.2.6. RX Audio Path
Receiver
Burst data is input from RF Module (IC601) to pin 17 (RXDA) of IC201.
In IC201, the burst data is converted to ADPCM, then to analog signal, and sent from pin 68 (LSR+) and pin 69 (LSR-) to the
receiver.
Headset
When the headset is inserted, a signal to the receiver is cut off and audio signal from pin 68 (LSR+) of IC201 is input to the
headset.
Speakerphone
In Speakerphone mode, the BBIC (IC201) makes pin 1 of IC401 from Low to High.
And an audio signal from pin 70 (LSR_HS) of IC201 is sent to a monitor speaker through speaker Amplifier IC (IC401).