CHAPTER 2
2 - 20
COPYRIGHT
©
2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MAR. 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
IV. CONTROL SYSTEM
A. Control System Diagram
Figure 2-21
B. Main PCB
The scanner is not equipped with CPU. The device driver installed in the host computer
includes a control program, which functions as CPU. Control program sends a command to the
ASIC in the main PCB, the ASIC controls the whole electrical circuits and image processing of
the scanner.
Main PCB consists of ASIC, DRAM, USB controller, analog I/C and motor driver.
ASIC
+12V
Host Computer
Main PCB
AC Adapter
Scanning Unit
Inverter &
Scanning Lamp
Drive Motor
DRAM
USB
Controller
Motor
Driver
Control
Program
Analog
IC