Service manual

CHAPTER 2
2 - 2
COPYRIGHT  2002 CANON INC. CANOSCAN 8000F REV.0 OCT. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
B. Electrical System
1. Outline
The scanner is not equipped with CPU. The device driver installed in the host computer
includes a control program, which functions as CPU. Host computer sends a command to the
ASIC via the USB controller, the ASIC controls the whole electrical circuits and image
processing of the scanner. The image signals read by the CCD are converted into digital data
by analog IC. The digital data is then processed by the ASIC and output to the host computer
via USB interface.
Figure 2-2
ASIC
USB
Controller
Regulator
Motor
Driver
FARE Unit
Drive
Motor
CCD PCB
Analog IC
Button PCB
+12V
AC adapter
Host Computer
Scanner Button
Power LED
DRAM
Home
Position
Sensor
Control
Program
J2
JP9
JP1
JP8
JP2
Scanning
Lamp
Inverter
PCB
J1
FAU
FAU Lamp
Inverter
PCB