36
KX-FC255CX-S
6.7.
NCU Section
6.7.1.
General
It is composed of bell detection circuit, pulse dial circuit, line amplifier, sidetone circuits.
6.7.2.
Bell Detection Circuit
1.
Circuit Operation
The signal waveform for each point is indicated below. The signal (low level section) input to pin 10 of BBIC IC4 on the digital
board.
TEL LINE
→
PC101 (1, 2
→
4)
→
IC4 (10)
6.7.3.
On/Off Hook Circuit
Normally (ON-HOOK condition), LINE RELAY (RL101) and Opt Isorator (PC102) is OFF. While OFF-HOOK, RL101 and PC102
turns ON. This LINE RELAY is controlled by pin 83 of IC4 through the Q101. PC102 is controlled by pin 12 of IC4 through the
Q104.
ON-HOOK:
IC4 (83) Low Level
→
Q101 OFF
→
RL101 OFF
IC4 (12) Low Level
→
Q104 OFF
→
PC102 OFF
OFF-HOOK:
IC4 (83) High Level
→
Q101 ON
→
RL101 ON
IC4 (12) High Level
→
Q104 ON
→
PC102 ON
6.7.4.
Pulse Dial Circuit
The pulse dial is generated by operating the transistor PC102 while OFF-HOOK (RL101 ON) condition.
Make state:
IC4 (12) High Level
→
Q104 ON
→
PC102 ON
Break state:
IC4 (12) Low Level
→
Q104 OFF
→
PC102 OFF
6.7.5.
Line Amplifier and Side Tone Circuit
1.
Circuit Operation
The reception signal output from the line transformer T101 is input to pin (2) of IC101 via C130, R138 and then the signal is
amplified at pin (1) of IC101 and sent to the reception system at through the LPF.
Содержание KX-FC255CX-S
Страница 18: ...18 KX FC255CX S 6 4 2 Block Diagram ...
Страница 20: ...20 KX FC255CX S ...
Страница 34: ...34 KX FC255CX S b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format ...
Страница 56: ...56 KX FC255CX S 9 2 Cordless Handset Programming 9 2 1 Cordless Handset Features ...
Страница 57: ...57 KX FC255CX S Note Refer to Program Mode Table P 98 ...
Страница 65: ...65 KX FC255CX S 11 2 Handset ...
Страница 68: ...68 KX FC255CX S 11 3 2 Service Mode Settings Note The above values are the default values ...
Страница 76: ...76 KX FC255CX S Countermeasure ...
Страница 77: ...77 KX FC255CX S REFERENCE Test Mode P 58 ...
Страница 78: ...78 KX FC255CX S REFERENCE Test Mode P 58 ...
Страница 79: ...79 KX FC255CX S REFERENCE Test Mode P 58 ...
Страница 80: ...80 KX FC255CX S REFERENCE Test Mode P 58 ...
Страница 81: ...81 KX FC255CX S ...
Страница 82: ...82 KX FC255CX S REFERENCE Test Mode P 58 ...
Страница 83: ...83 KX FC255CX S REFERENCE Test Mode P 58 ...
Страница 87: ...87 KX FC255CX S ...
Страница 112: ...112 KX FC255CX S ...
Страница 119: ...119 KX FC255CX S I O and Pin No Diagram ...
Страница 121: ...121 KX FC255CX S Other NG example while the power is ON and the LCD displays the following ...
Страница 122: ...122 KX FC255CX S 12 5 5 2 NG Example ...
Страница 126: ...126 KX FC255CX S 12 5 7 2 Troubleshooting Flow Chart ...
Страница 132: ...132 KX FC255CX S 12 5 11 Thermal Head Section Note Refer to Thermal Head P 19 ...
Страница 140: ...140 KX FC255CX S 13 Service Fixture Tools ...
Страница 145: ...145 KX FC255CX S 14 3 Disassembly Procedure 14 3 1 How to Remove the Image Sensor CIS ...
Страница 146: ...146 KX FC255CX S 14 3 2 How to Remove the Thermal Head ...
Страница 147: ...147 KX FC255CX S ...
Страница 148: ...148 KX FC255CX S 14 3 3 How to Remove the Bottom Frame ...
Страница 149: ...149 KX FC255CX S 14 3 4 How to Remove the P C Boards and Speaker ...
Страница 150: ...150 KX FC255CX S 14 3 5 How to Remove the Power Supply Board and AC Cord ...
Страница 151: ...151 KX FC255CX S 14 3 6 How to Remove the Gear Block and Separation Roller ...
Страница 152: ...152 KX FC255CX S 14 3 7 How to Remove the Gears Motors and Arms of the Gear Block ...
Страница 153: ...153 KX FC255CX S ...
Страница 154: ...154 KX FC255CX S 14 3 8 How to Remove the Cradle and Hook Switch Board ...
Страница 155: ...155 KX FC255CX S 14 3 9 How to Remove the Back Cover ...
Страница 156: ...156 KX FC255CX S 14 3 10 How to Remove the Platen Roller and Lock Lever ...
Страница 157: ...157 KX FC255CX S ...
Страница 158: ...158 KX FC255CX S 14 3 11 How to Remove the Pickup Roller and Antenna ...
Страница 159: ...159 KX FC255CX S 14 3 12 How to Remove the Operation Panel ...
Страница 160: ...160 KX FC255CX S 14 3 13 How to Remove the Operation Board MIC Board and LCD ...
Страница 161: ...161 KX FC255CX S 14 3 14 How to Remove the Separation Holder and Exit Roller ...
Страница 162: ...162 KX FC255CX S 14 3 15 Installation Position of the Lead Wires 14 3 15 1 Lower Section ...
Страница 163: ...163 KX FC255CX S ...
Страница 164: ...164 KX FC255CX S ...
Страница 165: ...165 KX FC255CX S ...
Страница 166: ...166 KX FC255CX S 14 3 15 2 Operation Panel Section ...
Страница 167: ...167 KX FC255CX S 14 3 15 3 Back Cover Section ...
Страница 168: ...168 KX FC255CX S 14 3 16 How to Remove the Cordless Handset Board ...
Страница 169: ...169 KX FC255CX S 14 3 16 1 Fix the LCD to the Cordless Handset Board ...
Страница 170: ...170 KX FC255CX S 14 3 17 How to Remove the Charger Board ...
Страница 192: ...192 KX FC255CX S 16 2 3 4 Copying Note See Sensor Locations in Sensor and Switches P 24 REFERENCE Sensor Section P 129 ...
Страница 198: ...198 KX FC255CX S 17 1 3 Operation Board Microphone Board 17 1 4 Power Supply Board 17 1 5 Interface Board ...
Страница 199: ...199 KX FC255CX S 17 1 6 Cordless Handset Board ...
Страница 202: ...202 KX FC255CX S 17 3 Test Chart 17 3 1 ITU T No 1 Test Chart ...
Страница 203: ...203 KX FC255CX S 17 3 2 ITU T No 2 Test Chart ...
Страница 204: ...204 KX FC255CX S 17 3 3 Test Chart ...
Страница 205: ...205 KX FC255CX S MEMO ...
Страница 218: ...218 KX FC255CX S 18 11 Charger Board PCB200 TP3 G J1 2 1 TP4 TP2 TP1 10 R1 10 R3 12 R2 12 R4 KX FC255CX S Charger Board ...
Страница 236: ...236 KX FC255CX S 21 1 2 Operation Panel Section ...
Страница 237: ...237 KX FC255CX S 21 1 3 Upper Cabinet Section ...
Страница 238: ...238 KX FC255CX S 21 1 4 Back Cover Section ...
Страница 239: ...239 KX FC255CX S ...
Страница 240: ...240 KX FC255CX S 21 1 5 Lower Cabinet Section ...
Страница 241: ...241 KX FC255CX S 21 1 6 Gear Block Section ...
Страница 242: ...242 KX FC255CX S ...
Страница 244: ...244 KX FC255CX S 21 1 8 Charger Section ...
Страница 245: ...245 KX FC255CX S 21 1 9 Screws ...