Canon imagerunner C5180 Service Manual page 175

Chapter 6
2. 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.
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
6-8
Start key
ON
SREADY
STBY
Reverse Forward Reverse
Forward Reverse
ON
Stream
reading
HP (shading )
position
CCD-KILL control*1
shift shading
fixed shading
white plate dust detection control
shading correction
Stream reading
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.
Not executed if 1 min or less (power off) from previous session.
SCRW
Forward
ON
ADF Dust
Image
end
Stream reading
shift position
shading
shift position
F-6-10
Original size detection
Shading
position Image leading edge
*1
*2
*2
*1
F-6-11
SCFW
STBY
Reverse Forward
Forward
HP (shading )
shift shading
fixed shading
white plate dust detection
control shading correction
CCD-KILL control*1
position
Stop position