Canon iR C6800 Series Service Manual page 190

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