Flow Of Image Signals - Canon FAXPHONE L75 Service Manual

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.
NCU board
Figure 2-9 G3 Transmission Image Signal Flow
LASER CLASS 1060P Chapter 2: Technical Reference
(6)
d
(2)
(5)
a
(3)
b
a
System controller IC
b
DRAM
c
MPU
d
MODEM IC
2-19
(1)
Contact sensor
(4)