CHAPTER 2
2 - 17
COPYRIGHT
2002 CANON INC. CANOSCAN 8000F REV.0 OCT. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
IV. CONTROL SYSTEM
A. Control System Diagram
Figure 2-17
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