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13.4. Power Supply Circuit
Function:
Power from the AC adaptor passes through a regulating block consisting of IC301.
Circuit Operation:
IC401 is a regulated power supply. The voltage at point A is regulated to 4.5 V by IC301.
The voltage at point B is dropped by D306 and D307 to 4.1 V.
The voltage at point C is dropped by D511 to 3.8 V.
The voltage at point D is dropped by Q304 to 4.3V
The voltage at point E is dropped by Q312, Q601 to 4.1V
13.5. DTMF Signal
When the DTMF data from the Handset is received, the DTMF signal is output from pin 36 of IC501 and sent to the line through
Q131.
48
KX-TC1868B / KX-TC1871B / KX-TC1872B
Содержание KX-TC1868B
Страница 4: ...2 LOCATION OF CONTROLS Base unit Handset 4 KX TC1868B KX TC1871B KX TC1872B ...
Страница 6: ...3 2 Handset only 6 KX TC1868B KX TC1871B KX TC1872B ...
Страница 7: ...3 3 Base unit only 7 KX TC1868B KX TC1871B KX TC1872B ...
Страница 10: ...5 1 Making Calls 5 OPERATION 5 1 1 With the Handset 10 KX TC1868B KX TC1871B KX TC1872B ...
Страница 11: ...11 KX TC1868B KX TC1871B KX TC1872B ...
Страница 12: ...5 1 2 With the Base Unit 12 KX TC1868B KX TC1871B KX TC1872B ...
Страница 13: ...13 KX TC1868B KX TC1871B KX TC1872B ...
Страница 15: ...5 3 1 Setting the Unit to Answer Calls 5 3 Automatic Answering Operation 15 KX TC1868B KX TC1871B KX TC1872B ...
Страница 16: ...5 4 Listening to Messages 16 KX TC1868B KX TC1871B KX TC1872B ...
Страница 17: ...5 4 1 During playback 17 KX TC1868B KX TC1871B KX TC1872B ...
Страница 18: ...6 DISASSEMBLY INSTRUCTIONS 18 KX TC1868B KX TC1871B KX TC1872B ...
Страница 20: ...7 ASSEMBLY INSTRUCTIONS 7 1 Asseembly the LCD to P C Board Base Unit 20 KX TC1868B KX TC1871B KX TC1872B ...
Страница 22: ...8 TROUBLESHOOTING GUIDE 22 KX TC1868B KX TC1871B KX TC1872B ...
Страница 23: ...8 1 Check Power 23 KX TC1868B KX TC1871B KX TC1872B ...
Страница 24: ...8 2 Error Message Table NOTE Flash memory is IC751 DSP is IC501 24 KX TC1868B KX TC1871B KX TC1872B ...
Страница 25: ...8 4 Check Playback 8 3 Check Record 25 KX TC1868B KX TC1871B KX TC1872B ...
Страница 26: ...8 5 Check Sp phone Voice Transmission 8 6 Check Sp phone Voice Reception 26 KX TC1868B KX TC1871B KX TC1872B ...
Страница 27: ...8 7 Check Battery Charge 27 KX TC1868B KX TC1871B KX TC1872B ...
Страница 28: ...8 8 Check Link 28 KX TC1868B KX TC1871B KX TC1872B ...
Страница 33: ...8 9 5 RF DSP interface signal wave form 33 KX TC1868B KX TC1871B KX TC1872B ...
Страница 35: ...8 12 Check Call ID 35 KX TC1868B KX TC1871B KX TC1872B ...
Страница 45: ...12 BLOCK DIAGRAM Base Unit KX TC1868B KX TC1871B KX TC1872B 45 ...
Страница 58: ...14 BLOCK DIAGRAM Handset 58 KX TC1868B KX TC1871B KX TC1872B ...
Страница 62: ...16 CPU DATA Base Unit 16 1 IC501 62 KX TC1868B KX TC1871B KX TC1872B ...
Страница 63: ...17 CPU DATA Handset 17 1 IC201 63 KX TC1868B KX TC1871B KX TC1872B ...
Страница 64: ...18 EXPLANATION OF IC TERMINALS RF Unit 18 1 IC101 64 KX TC1868B KX TC1871B KX TC1872B ...
Страница 66: ...20 CABINET AND ELECTRICAL PARTS Base Unit 66 KX TC1868B KX TC1871B KX TC1872B ...
Страница 67: ...21 CABINET AND ELECTRICAL PARTS Handset 67 KX TC1868B KX TC1871B KX TC1872B ...
Страница 68: ...22 ACCESSORIES AND PACKING MATERIALS 68 KX TC1868B KX TC1871B KX TC1872B ...
Страница 77: ...26 SCHEMATIC DIAGRAM RF Unit TX RX IC101 26 1 MEMO KX TC1868B KX TC1871B KX TC1872B 77 ...
Страница 78: ...KX TC1868B KX TC1871B KX TC1872B 78 ...
Страница 80: ...27 2 Flow Solder Side View KX TC1868B KX TC1871B KX TC1872B 80 ...
Страница 82: ...KX TC1868B KX TC1871B KX TC1872B 82 ...
Страница 83: ...29 CIRCUIT BOARD Handset C294 IC201 IC202 IC204 IC205 IC203 KX TC1868B KX TC1871B KX TC1872B 83 ...
Страница 84: ...KX TC1868B KX TC1871B KX TC1872B 84 ...
Страница 86: ...KX TC1868B KX TC1871B KX TC1872B 86 ...
Страница 87: ...87 KX TC1868B KX TC1871B KX TC1872B M W KXTC1868B KXTC1871B KXTC1872B Printed in Japan ...