Service manual

COPYRIGHT © 2000 CANON INC. CANOSCAN FB1210U REV.0 APR. 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2
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. Basic Sequences of Operations
........................................... 2-5
II. OPTICAL SYSTEM ..................... 2-7
A. Scanning Lamp.................... 2-8
B. Motor Control ..................... 2-9
III. IMAGE PROCESSING ............... 2-10
A. Outline .............................. 2-10
B. Image Processing............... 2-11
C. Calibration ........................ 2-13
D. Filter Processing ............... 2-14
E. Interpolation Processing.... 2-15
F. Averaging .......................... 2-16
G. Binary Processing .............. 2-17
H. Image Inversion
(negative/positive) ............ 2-18
IV. CONTROL SYSTEM ............ 2-19
A. Control System Diagram.... 2-19
B. Main PCB .......................... 2-19
V. INTERFACE ............................. 2-20
A. Overview of the USB Standard
......................................... 2-20
B. Benefits of the USB Scanner
......................................... 2-20
C. Signal Definitions .............. 2-21
D. Interface Connection ......... 2-21
VI. POWER SUPPLY ....................... 2-22