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CHAPTER 2
B. Electrical System
1. Outline
Figure 2-2 is an electric system circuit diagram.
The scanner is not equipped with CPU. The device driver with a control program installed in
the host computer functions as CPU. The host computer sends a command to the ASIC via
the USB controller or IEEE 1394 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 is output to the
host computer via USB interface.
J2
+24V
AC adapter
Scanning
Lamp
Inverter
PCB
JP1
CCD
PCB
FARE
Unit
2 - 2
Host Computer
Control
Program
JP9
JP9
USB
Controller
Regulator
ASIC
Analog IC
Figure 2-2
COPYRIGHT 2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
JP9
JP9
IEEE-1394
Controller
J1
Home
Position
Sensor
JP2
DRAM
JP8
Motor
Driver
FAU
Inverter
PCB
FAU Lamp
Button PCB
Scanner Button
Power LED
Drive
Motor
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