Panasonic KX-FG2452CX Service Manual page 63

6.14.5.10. Sending Signal
The voice signal from the microphone is input to DSP (90, 91). CN331 is the headset jack. When the headphone is connected,
Q331 detects it. The input from the microphone of the Handset (MIN, MIP) is cut and the microphone signal from the headset is
input to DSP (95). Also the power for the microphone is supplied from DSP (92) and the power is turned OFF on standby.
6.14.5.11. Reception Signal
The voice signal from the Base Unit is output to DSP (98) (HSSPOUT). This signal is led to the headset jack (CN331). The sig-
nal through the headset jack and the other signal output from DSP (97) drives the speaker. When the headset is inserted into
the jack, the voice signal is cut at the jack, so the sound does not come out from the speaker, but from the headset only.
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KX-FG2452CX