Canon CANOSCAN D1230 series Service Manual page 22

OPERATION AND TIMING
I. BASIC OPERATION ........................ 2-1
A. Functions ................................. 2-1
B. Electrical System ..................... 2-2
C. Main PCB Input and Output ... 2-4
D. Document Scanning
Sequence ................................. 2-6
II. OPTICAL SYSTEM .......................... 2-7
A. Outline ..................................... 2-7
B. Lamp Lighting Circuit .............. 2-8
C. FARE (Film Automatic Retouching
and Enhancement) ................. 2-10
D. Motor Control Circuit ............ 2-12
COPYRIGHT © 2001 CANON INC.
CHAPTER 2
CANOSCAN D1230U/D2400U REV.0 MARCH 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
III. IMAGE PROCESSING .................... 2-13
A. Outline ................................... 2-13
B. Image Processing ................... 2-13
IV. CONTROL SYSTEM ...................... 2-20
A. Control System Diagram ........ 2-20
B. Main PCB ............................... 2-20
V. INTERFACE ................................... 2-21
A. Outline of USB Standard ........ 2-21
B. Benefits of USB Scanner ........ 2-21
C. Signal Definitions .................. 2-22
D. Interface Connection ............. 2-22
VI. POWER SUPPLY ........................... 2-23