
6.3.1. Path from Telephone Line to Speaker
Audio from the telephone line passes via the normal signal path of J1 tel-line connector (TP26
and TP40), D8 bridge rectifier, T8 hookswitch (TP50), and R41, to BBIC IC6 pin 133. In the BBIC it
is converted from an analogue audio signal into digital data in the BBIC's internal codec.
Additionally, the speakerphone switching and echo suppression functions are contained within
the BBIC. An eight level speaker volume control is provided, and the functionality for this is also
contained within the BBIC. The analog data is sent from the BBIC IC6 pin 113 to the speaker
amplifier IC14 pin 4, via filter circuit (T14). The audio signal is amplified in IC14, and the push-
pull audio output is sent from IC14 pins 5 and 8 to the speaker (TP9) and (TP10).
6.3.2. Path from Microphone to Telephone Line
DC bias for the microphone is provided from the BBIC IC6 pin 118 (positive bias) and GND
(negative bias). The bias is fed to the microphone via R15 and R23 (positive bias) and R12
(negative bias). The balanced audio signal from the microphone is fed to the BBIC (IC6), via R77,
25
Содержание KX-TCD715EM
Страница 2: ...1 LOCATION OF CONTROLS 1 1 Base Unit 2 ...
Страница 3: ...1 2 Handset 3 ...
Страница 4: ...2 DISPLAYS 2 1 Icons 4 ...
Страница 5: ...2 2 Characters Symbols 2 3 Display Backlight 2 4 Lighted Handset Keypad 3 DISASSEMBLY INSTRUCUTIONS 5 ...
Страница 11: ...11 ...
Страница 12: ...12 ...
Страница 13: ...5 3 Answering Call 5 4 Summary of Programmable Functions 13 ...
Страница 14: ...14 ...
Страница 15: ...15 ...
Страница 16: ...16 ...
Страница 17: ...5 5 Programmable Settings 17 ...
Страница 18: ...18 ...
Страница 19: ...6 CIRCUIT OPERATION BASE UNIT BLOCK DIAGRAM BASEBAND SECTION AND LINE INTERFACE BASE UNIT 19 ...
Страница 32: ...7 2 RF SECTION 7 2 1 BLOCK DIAGRAM RF SECTION HANDSET 32 ...
Страница 39: ...10 2 HANDSET LINK 39 ...
Страница 40: ...40 ...
Страница 41: ...41 ...
Страница 42: ...10 3 HANDSET DOES NOT LINK 10 4 BATTERY DOES NOT CHARGE 42 ...
Страница 43: ...10 5 NO VOICE RECEPTION 10 6 NO VOICE TRANSMISSION 43 ...
Страница 44: ...10 7 BASE UNIT DOES NOT LINK 44 ...
Страница 45: ...10 8 BASE UNIT CALLER ID PROBLEMS 45 ...
Страница 46: ...11 CABINET AND ELECTRICAL PARTS LOCATION BASE UNIT 12 CABINET AND ELECTRICAL PARTS LOCATION HANDSET 46 ...
Страница 47: ...13 ACCESSORIES AND PACKING MATERIALS 47 ...
Страница 69: ...Unit 10 ms defaults to 100ms 69 ...
Страница 86: ... 3 4 5 6 7 2 1 IC402 ...
Страница 87: ...N M 3 4 5 6 7 2 1 IC402 IC400 KX TCD715EM SCHEMATIC DIAGRAM BASE UNIT RF Module ...
Страница 88: ...N M 3 4 5 6 7 2 1 IC402 IC400 KX TCD715EM SCHEMATIC DIAGRAM BASE UNIT RF Module ...
Страница 92: ...IC402 4 5 2 1 3 ...
Страница 93: ...IC400 IC402 3 4 5 2 1 KX TCD715EM SCHEMATIC DIAGRAM HANDSET RF Section ...
Страница 98: ...A KX TCD715EM SCHEMATIC DIAGRAM BASE UNIT Keypad ...
Страница 102: ......