Controlling The Scanner Drive System - Canon H1 Service Manual

2
Technology > Controls (Reader)

■ Controlling the Scanner Drive System

● Configuration of drive system
Parts configuration of scanner drive is described below.
Reader controller PCB (UN4)
Copyboard cover
open/closed sensor (S13)
Copyboard cover
open/closed sensor (S12)
CCD HP sensor (S11)
• Scanner motor (M14) drive signal
Turns on/off the motor and controls its direction/speed of rotation.
• CCD HP sensor (S11) detection signal
Checks if CCD is at home position.
• Copyboard cover open/closed sensor (front: S12/rear: S13) detection signal
Detects the open/close status of the copyboard cover
2 Technology > Controls (Reader)
Scanner motor (M14)
Carriage drive belt
Sensor light
block sheet
Forward
Backward
CCD unit
Guide shaft
● Scanner Motor Control
1) Forward movement when scanning an image
CCD operation is controlled by the following sensors when scanning the image.
Start position
Original
position
leading edge
Acceleration
Shift
speed
[1] [2]
Shift distance
[1]Acceleration area: Accelerates until a speed suited to the selected mode is reached
[2]Run-up speed area: Run-up margin to ensure a stable speed.
[3]Image reading area: Reads an image at a specific speed.
[4]Deceleration area: Decelerates and stops promptly once the image end is reached.
NOTE:
The scanning speed of this machine is as follows.
Black/white (600dpi x 600dpi):260 mm/sec
Color SEND(600dpi x 300dpi):140 mm/sec
F-2-4
2) Backward movement after scanning an image
After scanning an image, CCD moves backward to CCD shading position at a specific
speed (260 mm/sec).
Original
trailing edge
Stop
Deceleration
Normal speed
[3] [4]
F-2-5
2-3
2-3