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KX-FC265CX-S
6.8.
ITS (Integrated Telephone System) and Monitor Section
6.8.1.
Speakerphone Circuit
Function
This circuit controls the automatic switching of the transmitted and received signals, to and from the telephone line, when the
unit is used in the hands-free mode.
Circuit Operation
The speakerphone can only provide a one-way communication path.
In order words, it can either transmit an outgoing signal or receive an incoming signal at a given time, but cannot do both simul-
taneously. Therefore, a switching function is necessary to control the flow of the outgoing and incoming signals.
This switching function is contained in IC4 and consists of voice detector, TX attenuator, RX attenuator, comparator and attenu-
ator control. The function analyzes whether the TX (Transmit) or the RX (receiver) signal is louder, and then it processed the sig-
nal such that the louder signal is given precedence. The vice detector provides the attenuator control corresponding to the TX
signal. The comparator receives a TX and RX signals to the attenuator control corresponding to the RX signal. The attenuator
control provides a control signal to the TX and the RX attenuator to switch the appropriate signals ON and OFF. The attenuator
control also detects the level of the volume control to automatically adjust for changing ambient conditions.
Содержание KX-FC265CX-S
Страница 20: ...20 KX FC265CX S 6 4 2 Block Diagram ...
Страница 22: ...22 KX FC265CX S ...
Страница 35: ...35 KX FC265CX S b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format ...
Страница 58: ...58 KX FC265CX S Note Refer to Program Mode Table P 99 ...
Страница 66: ...66 KX FC265CX S 11 2 Cordless Handset ...
Страница 69: ...69 KX FC265CX S 11 3 2 Service Mode Settings Note The above values are the default values ...
Страница 77: ...77 KX FC265CX S Countermeasure ...
Страница 78: ...78 KX FC265CX S REFERENCE Test Mode P 59 ...
Страница 79: ...79 KX FC265CX S REFERENCE Test Mode P 59 ...
Страница 80: ...80 KX FC265CX S REFERENCE Test Mode P 59 ...
Страница 81: ...81 KX FC265CX S REFERENCE Test Mode P 59 ...
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Страница 83: ...83 KX FC265CX S REFERENCE Test Mode P 59 ...
Страница 84: ...84 KX FC265CX S REFERENCE Test Mode P 59 ...
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Страница 120: ...120 KX FC265CX S I O and Pin No Diagram ...
Страница 122: ...122 KX FC265CX S Other NG example while the power is ON and the LCD displays the following ...
Страница 123: ...123 KX FC265CX S 12 5 5 2 NG Example ...
Страница 127: ...127 KX FC265CX S 12 5 7 2 Troubleshooting Flow Chart ...
Страница 133: ...133 KX FC265CX S 12 5 11 Thermal Head Section Note Refer to Thermal Head P 21 ...
Страница 142: ...142 KX FC265CX S 13 Service Fixture Tools ...
Страница 146: ...146 KX FC265CX S 14 2 5 Cordless Handset Section REFERENCE E 1 How to Remove the Cordless Handset Board P 170 ...
Страница 147: ...147 KX FC265CX S 14 3 Disassembly Procedure 14 3 1 How to Remove the Image Sensor CIS ...
Страница 148: ...148 KX FC265CX S 14 3 2 How to Remove the Thermal Head ...
Страница 149: ...149 KX FC265CX S ...
Страница 150: ...150 KX FC265CX S 14 3 3 How to Remove the Bottom Frame ...
Страница 151: ...151 KX FC265CX S 14 3 4 How to Remove the P C Boards and Speaker ...
Страница 152: ...152 KX FC265CX S 14 3 5 How to Remove the Power Supply Board and AC Cord ...
Страница 153: ...153 KX FC265CX S 14 3 6 How to Remove the Gear Block and Separation Roller ...
Страница 154: ...154 KX FC265CX S 14 3 7 How to Remove the Gears Motors and Arms of the Gear Block ...
Страница 155: ...155 KX FC265CX S ...
Страница 156: ...156 KX FC265CX S 14 3 8 How to Remove the Charger Board A ...
Страница 157: ...157 KX FC265CX S 14 3 9 How to Remove the Back Cover ...
Страница 158: ...158 KX FC265CX S 14 3 10 How to Remove the Platen Roller and Lock Lever ...
Страница 159: ...159 KX FC265CX S ...
Страница 160: ...160 KX FC265CX S 14 3 11 How to Remove the Pickup Roller and Antenna ...
Страница 161: ...161 KX FC265CX S 14 3 12 How to Remove the Operation Panel ...
Страница 162: ...162 KX FC265CX S 14 3 13 How to Remove the Operation Board MIC Board and LCD ...
Страница 163: ...163 KX FC265CX S 14 3 14 How to Remove the Separation Holder and Exit Roller ...
Страница 164: ...164 KX FC265CX S 14 3 15 Installation Position of the Lead Wires 14 3 15 1 Lower Section ...
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Страница 168: ...168 KX FC265CX S 14 3 15 2 Operation Panel Section ...
Страница 169: ...169 KX FC265CX S 14 3 15 3 Back Cover Section ...
Страница 170: ...170 KX FC265CX S 14 3 16 How to Remove the Cordless Handset Board ...
Страница 171: ...171 KX FC265CX S 14 3 16 1 How to Replace the LCD ...
Страница 193: ...193 KX FC265CX S 16 2 3 4 Copying Note See Sensor Locations in Sensor and Switches P 26 REFERENCE Sensor Section P 130 ...
Страница 200: ...200 KX FC265CX S 17 1 7 Cordless Handset Board ...
Страница 205: ...205 KX FC265CX S 17 4 Test Chart 17 4 1 ITU T No 1 Test Chart ...
Страница 206: ...206 KX FC265CX S 17 4 2 ITU T No 2 Test Chart ...
Страница 207: ...207 KX FC265CX S 17 4 3 Test Chart ...
Страница 237: ...237 KX FC265CX S Memo ...
Страница 239: ...239 KX FC265CX S Memo ...
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Страница 267: ...267 KX FC265CX S YK KXFC265CXS ...