Service manual

2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MARCH 2001 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. 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

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