Canon CanoScan N656U Service Manual - Page 19

B. Outline of Electrical System, Main PCB, Start button, USB Connector, Gate array - driver

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CHAPTER 2 B. Outline of Electrical System Figure 2-2 shows the outline of electrical system. CPU is not equipped in the main PCB. The device driver installed in the host computer includes a control program, which functions as CPU. Image signals read by the contact image sensor are converted into digital data by the A/D converter in the gate array. The converted image data are image-processed by the gate array, then output to the host computer via USB port. Drive motor Contact image sensor CS1 M1 J2 J3 J1 USB Connector PCB J2 Main PCB J1 Buffer RAM Host computer Control program Start button Gate array S1 Home position sensor Q4 Figure 2-2 2 - 2 COPYRIGHT © 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)

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CHAPTER 2
2 - 2
COPYRIGHT
2000 CANON INC.
CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
J1
J3
M1
Main PCB
Start button
S1
USB Connector
PCB
Gate array
Home position
sensor
Q4
Host computer
Control
program
J2
J1
J2
Contact
image
sensor
CS1
Buffer
RAM
Drive motor
Figure 2-2
B. Outline of Electrical System
Figure 2-2 shows the outline of electrical system.
CPU is not equipped in the main PCB.
The device driver installed in the host computer includes a control program, which functions as
CPU.
Image signals read by the contact image sensor are converted into digital data by the A/D
converter in the gate array.
The converted image data are image-processed by the gate array,
then output to the host computer via USB port.