Canon ir2016, ir2020 マニュアル

3

Chapter 2  System Construction

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

F-2-2

It performs JBIG encoding/decoding and control of line communication and SDRAM.  SDRAM is connected with a bus of 32bit.

It controls ports, such as those in NCU or speaker.

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.

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.

It backups the transmitted/received image data stored in SDRAM.

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