5.6. MODEM SECTION
5.6.1. FUNCTION
The unit uses a 1 chip modem (IC1), enabling it to act as an interface between the control section for FAX sending and
receiving, and the telephone line. During a sending 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 (IC1) has hardware which sends and detects all of the necessary signals for FAX communication and
DTMF.
It can be controlled by writing commands from the ASIC (IC1) to the register in the modem (IC1).
This modem (IC1) also sends DTMF signals, generates a call tone (from the speaker), and detects busy tones, dial tones and
DTMF.
Overview of Facsimile Communication Procedures (ITU-T Recommendation):
1. ON ITU-T (International Telecommunications´ Union.)
The No. XIV Group of ITU-T, one of the four permanent organizations of the International Telecommunications Uniib (ITU),
investigates and make recommendations on international standards for facsimiles.
2. Definition of Each Group
•
•
Group I (G1)
A-4 size documents without using formats which reduce the band width of a signal sent over telephone lines.
Determined in 1968.
Transmission for about 6 minutes at 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)
A method of suppressing redundancy in the image signal prior to modulation is used. An A-4 size document is sent with
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-FT72BR-G
Summary of Contents for KX-FT72BR-G
Page 3: ...1 1 LCD MESSAGE 1 INTRODUCTION 3 KX FT72BR G ...
Page 8: ...1 11 TEST CHART 1 11 1 ITU T NO 1 TEST CHART 8 KX FT72BR G ...
Page 9: ...1 11 2 CCITT NO 2 TEST CHART 9 KX FT72BR G ...
Page 10: ...1 12 LOCATION OF CONTROLS 1 12 1 OVERVIEW 10 KX FT72BR G ...
Page 29: ...2 3 4 3 MULTIPLE FEED CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 84 29 KX FT72BR G ...
Page 30: ...2 3 4 4 SKEW CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 84 30 KX FT72BR G ...
Page 34: ...CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 84 34 KX FT72BR G ...
Page 39: ...2 3 5 1 4 THE UNIT CAN COPY BUT CANNOT TRANSMIT RECEIVE 39 KX FT72BR G ...
Page 45: ...45 KX FT72BR G ...
Page 46: ...CROSS REFERENCE TEST FUNCTIONS P 82 46 KX FT72BR G ...
Page 47: ...CROSS REFERENCE TEST FUNCTIONS P 82 47 KX FT72BR G ...
Page 48: ...48 KX FT72BR G ...
Page 49: ...CROSS REFERENCE TEST FUNCTIONS P 82 CROSS REFERENCE TEST FUNCTIONS P 82 49 KX FT72BR G ...
Page 50: ...50 KX FT72BR G ...
Page 51: ...51 KX FT72BR G ...
Page 52: ...CROSS REFERENCE TEST FUNCTIONS P 82 52 KX FT72BR G ...
Page 58: ...58 KX FT72BR G ...
Page 59: ...Normal Wave Patterns 59 KX FT72BR G ...
Page 61: ...CROSS REFERENCE NG EXAMPLE P 63 CHECK THE STATUS OF THE DIGITAL BOARD P 64 61 KX FT72BR G ...
Page 62: ...CROSS REFERENCE CHECK THE STATUS OF THE DIGITAL BOARD P 64 62 KX FT72BR G ...
Page 63: ...2 3 6 2 NG EXAMPLE 63 KX FT72BR G ...
Page 66: ...2 3 7 2 DEFECTIVE ITS INTEGRATED TELEPHONE SYSTEM SECTION 66 KX FT72BR G ...
Page 68: ...2 Troubleshooting Flow Chart 68 KX FT72BR G ...
Page 69: ...69 KX FT72BR G ...
Page 73: ...2 3 11 READ SECTION Refer to SCANNING BLOCK P 112 73 KX FT72BR G ...
Page 79: ...2 4 5 SERVICE MODE SETTINGS Example of a printed out list 79 KX FT72BR G ...
Page 85: ...3 2 HOW TO REMOVE THE OPERATION BLOCK 85 KX FT72BR G ...
Page 86: ...3 3 HOW TO REMOVE THE OPERATION BOARD AND LCD 86 KX FT72BR G ...
Page 87: ...3 4 HOW TO REMOVE THE BOTTOM FRAME AND ANALOG BOARD 87 KX FT72BR G ...
Page 88: ...3 5 HOW TO REMOVE THE DIGITAL POWER SUPPLY BOARD AND AC INLET 88 KX FT72BR G ...
Page 89: ...3 6 HOW TO REMOVE THE MOTOR BLOCK AND SEPARATION ROLLER 89 KX FT72BR G ...
Page 90: ...3 7 HOW TO REMOVE THE MOTOR AND GEARS OF MOTOR BLOCK 90 KX FT72BR G ...
Page 91: ...3 8 HOW TO REMOVE THE IMAGE SENSOR CIS 91 KX FT72BR G ...
Page 92: ...3 9 HOW TO REMOVE THE DOCUMENT FEED ROLLER 92 KX FT72BR G ...
Page 93: ...3 10 HOW TO REMOVE THE THERMAL HEAD 93 KX FT72BR G ...
Page 94: ...3 11 INSTALLATION POSITION OF THE LEAD WIRES 94 KX FT72BR G ...
Page 96: ...4 3 FLAT PACKAGE IC INSTALLATION PROCEDURE 4 4 BRIDGE MODIFICATION PROCEDURE 96 KX FT72BR G ...
Page 97: ...5 CIRCUIT OPERATIONS 5 1 CONNECTION DIAGRAM 97 KX FT72BR G ...
Page 99: ...5 2 1 General Block Diagram 99 KX FT72BR G ...
Page 109: ...5 4 2 BLOCK DIAGRAM 109 KX FT72BR G ...
Page 111: ...111 KX FT72BR G ...
Page 117: ...5 4 6 3 4 COPYING CROSS REFERENCE SENSOR SECTION P 72 117 KX FT72BR G ...
Page 132: ...5 10 1 CIRCUIT DIAGRAM 132 KX FT72BR G ...
Page 135: ...5 12 POWER SUPPLY BOARD SECTION 135 KX FT72BR G ...
Page 137: ...6 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 137 KX FT72BR G ...
Page 138: ...7 FIXTURES AND TOOLS 138 KX FT72BR G ...
Page 140: ...8 2 UPPER CABINET SECTION 140 KX FT72BR G ...
Page 141: ...8 3 LOWER CABINET P C B SECTION CROSS REFFERENCE MOTOR SECTION P 142 141 KX FT72BR G ...
Page 142: ...8 4 MOTOR SECTION 142 KX FT72BR G ...
Page 143: ...8 5 ACTUAL SIZE OF SCREWS 143 KX FT72BR G ...
Page 144: ...9 ACCESSORIES AND PACKING MATERIALS 144 KX FT72BR G ...
Page 163: ...163 KX FT72BR G Y M KXFT72BRG ...