Read Panasonic KX-TG1077UAB / KX-TG1077UAJ / KX-TG1077UAW / KX-TGA107UAB / KX-TGA107UAJ / KX-TGA107UAW Service Manual online
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KX-TG1077UAB/KX-TG1077UAJ/KX-TG1077UAW/KX-TGA107UAB/KX-TGA107UAJ/KX-TGA107UAW
4.5.
Signal Flow
4.5.1.
Talk mode:
Rx audio signal from line interface at "LINERX_P" path into B/S MCU (pin 32, 33) and then signal from B/S RF transform, H/S RF
receive signal forward to MCU, H/S MCU from (pin 32, 33) receive path output audio signal to receiver.
receive signal forward to MCU, H/S MCU from (pin 32, 33) receive path output audio signal to receiver.
Tx audio signal from MIC receive audio signal at mic path into H/S MCU and then audio signal from H/S RF transform, B/S RF
receive signal forward to MCU, B/S MCU audio signal from (Pin 30,29) at "LINETX_P" path transmit to line interface out of PSTN.
receive signal forward to MCU, B/S MCU audio signal from (Pin 30,29) at "LINETX_P" path transmit to line interface out of PSTN.
4.5.2.
Ringer detect:
Telephone line have ringer signal from tip ring into Base, and then Base transistor Q8 turn on and ringer data signal for Base MCU
(Pin 58_IOGP16) detect and the handset buzzer have product "Melody tone" .
(Pin 58_IOGP16) detect and the handset buzzer have product "Melody tone" .
4.5.3.
Type I CID receive:
CID signal from tip ring couple CID signal at (CID1_P, CID1_N) path into Base MCU (Pin 29, 30) detect, Handset display show the
telephone no.
telephone no.
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