12
KX-FC255CX-S
6.2.
General Block
The following is an outline of each device IC on the digital board. (Refer to
(P.13).).
1. ASIC (IC10)
Composed mainly of an address decoder and a modem control.
Controls the general FAX operations.
Controls the operation panel I/F.
Controls the thermal head I/F and CIS I/F.
Performs the image processing.
CPU and Real time clock
Provides the reset pulse for each of the major ICs.
2. Flash ROM (IC16)
Contains all of the program instructions on the unit operations.
This memory is used mainly for the parameter working in the storage area.
3. Dynamic RAM (IC17)
This memory is used mainly for the parameter working in the storage area.
4. MODEM (IC3)
Performs the modulation and the demodulation for FAX communication.
5. Read Section
CIS image sensor to read transmitted documents.
6. Motor Driver (IC401)
Drives the transmission motor and the reception motor.
7. Thermal Head
Contains heat-emitting elements for dot matrix image printing.
8. BBIC (
B
ase
B
and IC): IC4
Handling all the audio, signal and data processing needed in a DECT base unit
Controlling the DECT specific physical layer and radio section (
B
urst
M
odule
C
ontroller section)
ADPCM codec filter for speech encoding and speech decoding (DSP section)
Echo-cancellation and Echo-suppression (DSP section)
Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
DTMF receiver (DSP section)
Clock Generation for RF Module
ADC, DAC, timer, and power control circuitry
All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)
9. RF Module: IC28
PLL Oscillator
Detector
Compress/Expander
First/Second Mixer
Amplifier for transmission and reception
10. FLASH MEMORY: IC23
Voice Prompt (TAM) D/L (
D
own
L
oad) Area
Programming for BBIC (IC4)
11. EEPROM: IC22
Temporary operating parameters (for RF, etc.)
12. Sensor Section
Composed of a cover open and film end switch, a document set switch, a document top switch, a paper top sensor and a
motor position switch.
13. Power Supply Board Switching Section
Su4V, +6V and +24V to the unit.
Summary of Contents for KX-FC255CX-S
Page 18: ...18 KX FC255CX S 6 4 2 Block Diagram ...
Page 20: ...20 KX FC255CX S ...
Page 56: ...56 KX FC255CX S 9 2 Cordless Handset Programming 9 2 1 Cordless Handset Features ...
Page 57: ...57 KX FC255CX S Note Refer to Program Mode Table P 98 ...
Page 65: ...65 KX FC255CX S 11 2 Handset ...
Page 68: ...68 KX FC255CX S 11 3 2 Service Mode Settings Note The above values are the default values ...
Page 76: ...76 KX FC255CX S Countermeasure ...
Page 77: ...77 KX FC255CX S REFERENCE Test Mode P 58 ...
Page 78: ...78 KX FC255CX S REFERENCE Test Mode P 58 ...
Page 79: ...79 KX FC255CX S REFERENCE Test Mode P 58 ...
Page 80: ...80 KX FC255CX S REFERENCE Test Mode P 58 ...
Page 81: ...81 KX FC255CX S ...
Page 82: ...82 KX FC255CX S REFERENCE Test Mode P 58 ...
Page 83: ...83 KX FC255CX S REFERENCE Test Mode P 58 ...
Page 87: ...87 KX FC255CX S ...
Page 112: ...112 KX FC255CX S ...
Page 119: ...119 KX FC255CX S I O and Pin No Diagram ...
Page 121: ...121 KX FC255CX S Other NG example while the power is ON and the LCD displays the following ...
Page 122: ...122 KX FC255CX S 12 5 5 2 NG Example ...
Page 126: ...126 KX FC255CX S 12 5 7 2 Troubleshooting Flow Chart ...
Page 132: ...132 KX FC255CX S 12 5 11 Thermal Head Section Note Refer to Thermal Head P 19 ...
Page 140: ...140 KX FC255CX S 13 Service Fixture Tools ...
Page 145: ...145 KX FC255CX S 14 3 Disassembly Procedure 14 3 1 How to Remove the Image Sensor CIS ...
Page 146: ...146 KX FC255CX S 14 3 2 How to Remove the Thermal Head ...
Page 147: ...147 KX FC255CX S ...
Page 148: ...148 KX FC255CX S 14 3 3 How to Remove the Bottom Frame ...
Page 149: ...149 KX FC255CX S 14 3 4 How to Remove the P C Boards and Speaker ...
Page 150: ...150 KX FC255CX S 14 3 5 How to Remove the Power Supply Board and AC Cord ...
Page 151: ...151 KX FC255CX S 14 3 6 How to Remove the Gear Block and Separation Roller ...
Page 152: ...152 KX FC255CX S 14 3 7 How to Remove the Gears Motors and Arms of the Gear Block ...
Page 153: ...153 KX FC255CX S ...
Page 154: ...154 KX FC255CX S 14 3 8 How to Remove the Cradle and Hook Switch Board ...
Page 155: ...155 KX FC255CX S 14 3 9 How to Remove the Back Cover ...
Page 156: ...156 KX FC255CX S 14 3 10 How to Remove the Platen Roller and Lock Lever ...
Page 157: ...157 KX FC255CX S ...
Page 158: ...158 KX FC255CX S 14 3 11 How to Remove the Pickup Roller and Antenna ...
Page 159: ...159 KX FC255CX S 14 3 12 How to Remove the Operation Panel ...
Page 160: ...160 KX FC255CX S 14 3 13 How to Remove the Operation Board MIC Board and LCD ...
Page 161: ...161 KX FC255CX S 14 3 14 How to Remove the Separation Holder and Exit Roller ...
Page 162: ...162 KX FC255CX S 14 3 15 Installation Position of the Lead Wires 14 3 15 1 Lower Section ...
Page 163: ...163 KX FC255CX S ...
Page 164: ...164 KX FC255CX S ...
Page 165: ...165 KX FC255CX S ...
Page 166: ...166 KX FC255CX S 14 3 15 2 Operation Panel Section ...
Page 167: ...167 KX FC255CX S 14 3 15 3 Back Cover Section ...
Page 168: ...168 KX FC255CX S 14 3 16 How to Remove the Cordless Handset Board ...
Page 169: ...169 KX FC255CX S 14 3 16 1 Fix the LCD to the Cordless Handset Board ...
Page 170: ...170 KX FC255CX S 14 3 17 How to Remove the Charger Board ...
Page 199: ...199 KX FC255CX S 17 1 6 Cordless Handset Board ...
Page 202: ...202 KX FC255CX S 17 3 Test Chart 17 3 1 ITU T No 1 Test Chart ...
Page 203: ...203 KX FC255CX S 17 3 2 ITU T No 2 Test Chart ...
Page 204: ...204 KX FC255CX S 17 3 3 Test Chart ...
Page 205: ...205 KX FC255CX S MEMO ...
Page 236: ...236 KX FC255CX S 21 1 2 Operation Panel Section ...
Page 237: ...237 KX FC255CX S 21 1 3 Upper Cabinet Section ...
Page 238: ...238 KX FC255CX S 21 1 4 Back Cover Section ...
Page 239: ...239 KX FC255CX S ...
Page 240: ...240 KX FC255CX S 21 1 5 Lower Cabinet Section ...
Page 241: ...241 KX FC255CX S 21 1 6 Gear Block Section ...
Page 242: ...242 KX FC255CX S ...
Page 244: ...244 KX FC255CX S 21 1 8 Charger Section ...
Page 245: ...245 KX FC255CX S 21 1 9 Screws ...