Canon CANOSCAN N1220U Service Manual page 19

OPERATION AND TIMING
I. BASIC OPERATION ........................ 2-1
A. Functions ................................ 2-1
B. Outline of Electrical System ... 2-2
C. Main PCB Input and Output ... 2-3
D. Basic Sequences .................... 2-4
II. OPTICAL SYSTEM ....................... 2-11
A. Outline .................................. 2-11
B. Document Scanning Sequence ....
............................................... 2-12
C. Contact Image Sensor ........... 2-13
COPYRIGHT 2000 CANON INC.
CHAPTER 2
CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
D. Drive Motor Control Circuit
............................................... 2-16
III. IMAGE PROCESSING SYSTEM .... 2-17
A. Outline .................................. 2-17
B. Image Processing Functions .......
............................................... 2-18
IV. CONTROL SYSTEM ..................... 2-20
A. Outline .................................. 2-20
B. Outline of USB ...................... 2-21
V. POWER SUPPLY ........................... 2-23