Electrical System - Canon CANOSCAN D1230 series Service Manual

CHAPTER 2
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.
J2
AC Adapter
Scanning
Lamp
Inverter
PCB
JP1
CCD
Analog IC
PCB
FARE
Unit
(D2400U only)
2 - 2
COPYRIGHT
Host Computer
Control
Program
USB
Controller
Regulator
ASIC
Figure 2-2
©
2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MAR. 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
JP9
J1
JP2
Home
Position
Sensor
DRAM
JP8
Motor
Driver
FAU
Button PCB
Start Button
Power LED
Drive
Motor