Canon CANOSCAN FB330 series Service Manual page 38

CHAPTER 2
NO
2 - 10
COPYRIGHT © 1999 CANON INC. CANOSCAN FB330/FB630 SERIES REV.0 OCT. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Detects border between
black and white
Sets detection mode for border
between black and white
G LED ON
Sets document feed distance
(max. 15 mm)
Moves scanning unit forward
Peak light intensity to CIS
reached white level?
YES
Stops scanning unit
Obtains 1 line of data
**** RAM*
to buffer RAM
1********
White level in
both ends of the obtained
data is normal?
NO
Moves 1 line
1*****
Scanning unit
moved forward more
than 2 mm?
YES
4
Figure 2-6-5
NO
Fixed feeding
limit (max. 15 mm) was
exceeded?
YES
Sets error flag
********
YES
LED **
G LED OFF
Standby
NO
4