Canon Color imageRUNNER C4580 Service Manual - page 175
Chapter 6
6-8
2. Basic Sequence of Operation in Response to a Press on the Start Key (ADF mode; 1 original)
F-6-10
F-6-11
Reader motor
Original scanning
lamp
HP sensor
Start key
ON
STBY
STBY
SREADY
SCRW
SCFW
Reverse
Forward
Not executed if 1 min or less (power off) from previous session.
Reverse
Reverse
ON
ON
Scanner unit position
HP (shading )
HP (shading )
Image
end
Stream reading
shift position
CCD-KILL control*1
Forward Reverse
shift shading
fixed shading
white plate dust detection control
shading correction
Forward
Forward
Forward
Stream
reading
position
ADF Dust
shading
shift position
shift shading
fixed shading
white plate dust detection
control shading correction
*1: controls by turning on/off the power of the CCD and the circuitry around it for power saving and for
protection against overheating.
CCD-KILL control*1
1. HP positioning
2. move to shift shading
start position
6.original stream reading
scan
7.shifts to point
of dust detection
Stream reading
position
Shading
position Image leading edge
Stop position
Original size detection
position
*1: shifts only if the copyboard cover (ADF) is open
*2: executed only if 1 min (power ON) or more has passed from the previous session.
3.shift shading
4.fixed shading
- white plate dust detection
shading correction
5.stream reading
position to shift
8.shifts to point of
stand by position
9.moves to shift shading start
position
10.shift shading
11.fixed shading
- white plate dust detection
shading correction
*1
*1
*2
*2