Read Panasonic KX-TC1800B Service Manual online
22.6. Sending Signal
The voice signal from the microphone is amplified at Q105, and input to pin 96 (AIN) of IC140 (BBIC). CN101 is the headphone
jack. When the headphone is connected, the input from the microphone of the handset is cut and the microphone signal from the
headphone is input to Q105. Also the power for the microphone is supplied from Q170, and the power is turned OFF on standby.
jack. When the headphone is connected, the input from the microphone of the handset is cut and the microphone signal from the
headphone is input to Q105. Also the power for the microphone is supplied from Q170, and the power is turned OFF on standby.
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KX-TC1800B
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