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10
KX-TCA275CE
4.2.5.
TX Audio Path
Microphone
An audio signal from microphone is input to pin 118 (MIC+) of IC3 via headset jack (CN1).
In IC3, the audio signal is converted from the analog signal to ADPCM, then to burst data, and sent from pin 28 (TXDA) to RF
Module. The stabilized supply voltage is fed to the microphone from pin 119 (VREF+) of IC3.
To reduce consumption current, this voltage is supplied only while calling or receiving.
Headset
When a headset is inserted, a signal from microphone is cut off and an audio signal from a headset is input to pin 118 (MIC+).
Headset detection
When a headset is inserted, pin 41 (ADC2) of IC3 goes from Low to High (around 1V) and BBIC (IC3) detects the insertion of
the headset.
Содержание KX-TCA275CE
Страница 15: ...15 KX TCA275CE 5 Location of Controls and Components 5 1 Handset ...
Страница 16: ...16 KX TCA275CE ...
Страница 19: ...19 KX TCA275CE 7 Operating Instructions 7 1 Soft Keys ...
Страница 20: ...20 KX TCA275CE ...
Страница 21: ...21 KX TCA275CE 7 2 Handset Setting Menu Layout ...
Страница 23: ...23 KX TCA275CE 7 5 DISPLAY ...
Страница 25: ...25 KX TCA275CE 7 7 Function Keys ...
Страница 26: ...26 KX TCA275CE 7 8 Flexible Keys ...
Страница 27: ...27 KX TCA275CE 7 9 Caller ID ...
Страница 28: ...28 KX TCA275CE 7 10 Character Mode Table ...
Страница 31: ...31 KX TCA275CE Charger Unit NO Display On the LCD ...
Страница 32: ...32 KX TCA275CE 5V Circuit 8 2 Battery Charge Trouble Handset 8 2 1 Charge On ...
Страница 33: ...33 KX TCA275CE 8 2 2 Charge Off ...
Страница 34: ...34 KX TCA275CE 8 3 LED Trouble Handset 8 3 1 Key Back Light 8 3 2 Charging And Ringing LED ...
Страница 36: ...36 KX TCA275CE 8 6 No Voice Transmission ...
Страница 37: ...37 KX TCA275CE 8 7 No Voice Reception 8 7 1 Talk Mode ...
Страница 39: ...39 KX TCA275CE 9 Service Fixture Tools ...
Страница 46: ...46 KX TCA275CE 4 6 Downloading Start After several seconds Display shows Flash Program Start ...
Страница 55: ...55 KX TCA275CE 12 2 Terminal Guide of the ICs Transistors and Diodes 12 2 1 Handset 12 2 2 Charger Unit ...
Страница 65: ...65 KX TCA275CE 16 2 Cabinet and electrical Parts Location 16 2 1 Handset ...
Страница 66: ...66 KX TCA275CE 16 2 2 Charger Unit ...
Страница 67: ...67 KX TCA275CE 16 2 3 Accessories and Packing Materials ...