Table of Contents
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CHAPTER
6
FACSIMILE SYSTEM
1. INTRODUCTION...................................................................... 6-2
2. SCNT BOARD.......................................................................... 6-3
2.1
System Control Section................................................... 6-3
2.2
Communications Control Section .................................... 6-4
2.3
Reading Control Section ................................................. 6-4
2.4
Printer Control Section .................................................... 6-4
3. NCU BOARD............................................................................ 6-5
3.1
Off-hook Detection .......................................................... 6-6
3.2
Formation of DC Loop ..................................................... 6-6
3.3
Detection of Calling Identification (CI) ............................. 6-9
3.4
Line Signal Monitor ....................................................... 6-10
3.5
Dial Control ................................................................... 6-11
3.6
2-wire/4-wire Conversion............................................... 6-12
3.7
Protective Circuits ......................................................... 6-12
3.8
Telephone Connection Control ...................................... 6-14
3.9
Relay Operations........................................................... 6-17
4. OPCNT BOARD ..................................................................... 6-18
4.1
Detection of Button Input............................................... 6-18
4.2
LED Lighting Control ..................................................... 6-21
4.3
Display Indication Control.............................................. 6-21
5. FLOW OF IMAGE SIGNALS .................................................. 6-22
5.1
Transmission ................................................................. 6-22
5.2
Reception ...................................................................... 6-23
6. POWER SUPPLY UNIT.......................................................... 6-24
6.1
Switching Regulator ...................................................... 6-24
6.2
7. G4CNT BOARD ..................................................................... 6-32
6
1
2
3
4
5
6
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