Panasonic KX-TG6321S Service Manual page 25

4.7.5. Sending Signal
The voice signal from the microphone is input to DSP (90, 91). Also the power for the microphone is supplied from DSP (92) and
the power is turned OFF on standby.
4.7.6. Reception Signal
The voice signal from the base unit is output to DSP (98). This signal is led to R435 and drives the speaker, and the other signal
output from DSP (97) drives the speaker.
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KX-TG6321S/KX-TG6323PK/KX-TGA630S