Canon multipass c3000 Service Manual (en)

Download
6.3 Flow of Image Signals
a) G3 transmission
(1) With the LED as a light source, the image is scanned by the contact sensor, and
analogue image data sent to the SCNT board.
(2) The System controller IC (Internal UHQ unit) converts analogue image data from the
contact sensor to digital image data.
(3) The system controller IC converts processed image data from serial data to parallel data,
and writes them to the DRAM.
(4) The MPU encodes raw data in the DRAM using a soft codec, and rewrites the encoded
data into the DRAM.
(5) The MODEM IC modulates the coded image data.
(6) The modulated data are then sent from the MODEM IC to the NCU board.
(7) The data are returned to the SCNT board and, from there, are sent to the line for
transmission.
Chapter 2: Technical Reference
2-31
SCNT board
c
b
a     System controller IC
b     DRAM
c     MPU
d     MODEM IC
NCU
board
Contact sensor
b
(6)
(7)
(4)
(6)
(7)
d
a
(2)
(3)
(4)
(1)
(5)
PCNT board
Figure 2-22 G3 Transmission Image Signal Flow