Canon MultiPASS C530 Service Manual page 112

e) Color image scan
(1) Using the LED as a light source, the image is scanned by the contact sensor, and RGB analogue image
data is sent to the SPCNT board.
(2) The System controller IC (Internal UHQ unit) converts analogue image data from the contact sensor
to RGB digital image data.
(3) The system controller IC converts the RGB digital image data from serial data to parallel data, and
writes them to the DRAM.
(4) The RGB data is encoded and written to DRAM.
(5) The system controller IC sends the data written into DRAM to the PC using the bi-centronics
interface.
a
System controller IC
b
MPU
c DRAM
MultiPASS C530/C560 Chapter 2: Technical Reference
(4)
c
Modem board
Figure 2-24 Color Image Scan Signal Flow
2-33
Contact sensor
(1)
(3)
(1)
b
(2)
a
(5)
SPCNT board
PC
(5)