Canon Super G3 FAX Board-T1, Portable Manual

Page: 11 / 16

Chapter 2
3
Chapter 2 System Construction
2.1 Basic Construction
2.1.1 Overview
0010-8843
The board is designed to enable a digital copier to serve as a high-performance multi-functional machine (image processing functions and communication functions
over the telephone line).
It is capable of communicating at a maximum rate of 33.6 kbps, thanks to the presence of a V.34-compliant modem (ITU-T).
F-2-1
[1] Modem PCB
[2] Modular PCB
[3] NCU PCB
[4] Speaker unit
2.1.2 Modem PCB
0010-9262
F-2-2
MPU (IC1)
It performs JBIG encoding/decoding and control of line communication and SDRAM. SDRAM is connected with a bus of 32bit.
PATCH (IC40)
It controls ports, such as those in NCU or speaker.
SDRAM
It is used as the memory for encoding/decoding of image data during transmitting/receiving and that for MPU work area.
In addition, it is used for storing the transmitted/received image data.
MODEM IC (IC1)
CONEXTANT FM336Plus modem modulates the transmitted data from MPU via line based on the ITU-T V.17, V.21, V.27ter., V.29 and V.34.
In receiving, it demodulates the received data via line based on the ITU-T V.17, V.21, V.27ter., V.29, and V34.
Super Capacitor
It backups the transmitted/received image data stored in SDRAM.
DC/DC
It generates the voltage to backup SDRAM by raising the voltage of super capacitor when main power is shut down or fails.
[1]
[2] [3]
[4]
SDRAM
Speaker
PATCH
(IC40)
MPU
(IC1)
MODEM IC
FM336Plus
(IC1)
16
b
i
t
32bit
Speaker
driver
(IC70)
Image Processor PCB Modem PCB
NCU PCB
Super
Capacitor
DC/DC