8.7. MODEM SECTION
8.7.1. FUNCTION
The unit uses a 1 chip modem (IC505) that serves as an interface between the control section for FAX transmission and
reception and the telephone line. During a transmitting operation, the digital image signals are modulated and sent to the
telephone line.
During a receiving operation, the analog image signals which are received via the telephone line are demodulated and
converted into digital image signals. The communication format and procedures for FAX communication are standardized by
ITU-T. This 1 chip modem (IC505) has hardware which sends and detects all of the necessary signals for FAX communication.
It can be controlled by writing commands from the CPU (IC501: inside ASIC) to the register in the modem (IC505).
This modem (IC505) also sends DTMF signals, generates a call tone (from the speaker), and detects a busy tone and dial
tones.
Overview of Facsimile Communication Procedures (ITU-T Recommendation):
1. ON CCITT (International Telegraph and Telephone Consultative Committee)
The No. XIV Group of ITU-T, one of the four permanent organizations of the International Telecommunications Union (ITU),
investigates and make recommendations on international standards for facsimiles.
2. Definition of Each Group
·
Group I (G1)
Official A-4 size documents without using formats which reduce the band width of a signal are sent over telephone lines.
Determined in 1968.
Transmission for about 6 minutes at a scanning line density of 3.85 lines/mm.
·
Group II (G2)
Using reduction technology in the modulation/demodulation format, an A-4 size document is sent at an official scanning line
density of 3.85 lines/mm for about 3 minutes.
Methods to suppress redundancy are not used.
Determined in 1976.
·
Group III (G3)
Method of suppressing redundancy in the image signal prior to modulation is used. An A-4 size document is sent within
about one minute.
Determined in 1980.
·
Group IV (G4)
Transmission is via the data network. A method is provided for suppressing redundancy in signals prior to transmission, and
error-free reception of transmission is possible.
The scope of these facsimile applications is not limited simply to transmission of written statements. Through symbiotic
linkages with other communication methods, it can be expected to expand to include integrated services.
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KX-FHD333BR
Содержание KX-FHD333BR
Страница 3: ...1 TRANSLATION LISTS 1 1 LCD MESSAGES 3 KX FHD333BR ...
Страница 4: ...1 2 ERROR CODE 1 3 BUTTON LISTS 4 KX FHD333BR ...
Страница 21: ...5 1 2 COMPONENT LOCATIONS 21 KX FHD333BR ...
Страница 32: ...6 2 DISASSEMBLY PROCEDURE 6 2 1 HOW TO REMOVE THE PAPER TRAY AND RECORDING PAPER SUPPORT 32 KX FHD333BR ...
Страница 33: ...6 2 2 HOW TO REMOVE THE OPERATION PANEL BLOCK 33 KX FHD333BR ...
Страница 34: ...6 2 3 HOW TO REMOVE THE OPERATION BOARD AND LCD 34 KX FHD333BR ...
Страница 35: ...6 2 4 HOW TO REMOVE THE IMAGE SENSOR CIS 35 KX FHD333BR ...
Страница 36: ...6 2 5 HOW TO REMOVE THE THERMAL HEAD 36 KX FHD333BR ...
Страница 37: ...6 2 6 HOW TO REMOVE THE PLATEN ROLLER AND BACK COVER 37 KX FHD333BR ...
Страница 38: ...6 2 7 HOW TO REMOVE THE PICKUP ROLLER 38 KX FHD333BR ...
Страница 39: ...6 2 8 HOW TO REMOVE THE CASSETTE LEVER 39 KX FHD333BR ...
Страница 40: ...6 2 9 HOW TO REMOVE THE BOTTOM FRAME 40 KX FHD333BR ...
Страница 41: ...6 2 10 HOW TO REMOVE THE DIGITAL ANALOG POWER SUPPLY SENSOR BOARDS AND AC INLET 41 KX FHD333BR ...
Страница 42: ...6 2 11 HOW TO REMOVE THE MOTOR BLOCK AND SEPARATION ROLLER 42 KX FHD333BR ...
Страница 43: ...6 2 12 HOW TO REMOVE THE GEARS OF MOTOR BLOCK 43 KX FHD333BR ...
Страница 44: ...6 3 INSTALLATION POSITION OF THE LEAD WIRES 44 KX FHD333BR ...
Страница 57: ...7 5 2 SREVICE MODE SETTINGS Note The above values are the default values 57 KX FHD333BR ...
Страница 71: ...71 KX FHD333BR ...
Страница 85: ...85 KX FHD333BR ...
Страница 86: ...CROSS REFERENCE TEST FUNCTIONS P 50 86 KX FHD333BR ...
Страница 87: ...CROSS REFERENCE TEST FUNCTIONS P 50 87 KX FHD333BR ...
Страница 88: ...CROSS REFERENCE TEST FUNCTIONS P 50 88 KX FHD333BR ...
Страница 89: ...CROSS REFERENCE TEST FUNCTIONS P 50 89 KX FHD333BR ...
Страница 90: ...90 KX FHD333BR ...
Страница 91: ...91 KX FHD333BR ...
Страница 92: ...CROSS REFERENCE TEST FUNCTIONS P 50 92 KX FHD333BR ...
Страница 96: ...96 KX FHD333BR ...
Страница 100: ...I O and Pin No Diagram 100 KX FHD333BR ...
Страница 101: ...7 6 7 1 CHECK THE STATUS OF THE DIGITAL BOARD CROSS REFERENCE NG Wave pattern Refer to NG EXAMPLE P 98 101 KX FHD333BR ...
Страница 104: ...7 6 7 3 NG EXAMPLE 104 KX FHD333BR ...
Страница 109: ...7 6 9 2 TROUBLESHOOTING FLOW CHART 109 KX FHD333BR ...
Страница 115: ...7 6 13 THERMAL HEAD SECTION Refer to THERMAL HEAD P 129 115 KX FHD333BR ...
Страница 116: ...8 CIRCUIT OPERATIONS 8 1 CONNECTION DIAGRAM 116 KX FHD333BR ...
Страница 118: ...8 2 1 GENERAL BLOCK DIAGRAM 118 KX FHD333BR ...
Страница 120: ...8 3 2 MEMORY MAP 120 KX FHD333BR ...
Страница 128: ...8 4 2 BLOCK DIAGRAM 128 KX FHD333BR ...
Страница 131: ...TIMING CHART i Print Duty 50 or less ii Print Duty more than 50 131 KX FHD333BR ...
Страница 143: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 143 KX FHD333BR ...
Страница 150: ...150 KX FHD333BR ...
Страница 159: ...9 REFERENCE MATERIAL DATA 9 1 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 159 KX FHD333BR ...
Страница 162: ...9 3 TEST CHART 9 3 1 ITU T No 1 TEST CHART 162 KX FHD333BR ...
Страница 163: ...9 3 2 ITU T No 2 TEST CHART 163 KX FHD333BR ...
Страница 164: ...10 FIXTURES AND TOOLS 164 KX FHD333BR ...
Страница 165: ...11 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 11 1 GENERAL SECTION 165 KX FHD333BR ...
Страница 166: ...11 2 OPERATION PANEL SECTION 166 KX FHD333BR ...
Страница 167: ...11 3 BACK COVER SECTION 167 KX FHD333BR ...
Страница 168: ...168 KX FHD333BR ...
Страница 169: ...11 4 UPPER CABINET SECTION 169 KX FHD333BR ...
Страница 170: ...11 5 LOWER CABINET P C BOARD SECTION CROSS REFERENCE MOTOR SECTION P 171 170 KX FHD333BR ...
Страница 171: ...11 6 MOTOR SECTION 11 7 ACTUAL SIZE OF SCREWS 171 KX FHD333BR ...
Страница 172: ...12 ACCESSORIES AND PACKING MATERIALS 172 KX FHD333BR ...