Canon imageRUNNER 2525 Series, Service Manual, Page: 37 / 402

• Copyboard cover open/closed sensor (front: S32/rear: S33) detection signal
Detects the open/close status of the copyboard cover
● Scanner Motor Control
Scanner motor driver turns on/off the motor and controls its direction/speed of rotation according to the signals from CPU.
Reader relay PCB
5V +24V
RTP3APWN
RTP3BPWN
RTP3A
RTP3B
MO_ACTIVE
+5V
J559
B*
B
A
A*
IC2
Motor
driver
1
2
3
4
M31
NOTE:
The scan speed of this machine is as follows:
Copy (100%): 123 mm/sec
Color send (300 dpi x 300 dpi): 123 mm/sec or 61.5 mm/sec
1. Forward Movement during Image Scan
During image scan, operation of the contact image sensor (CIS) is controlled by controlling the motor as shown below.
Start position
position
Acceleration
Original
leading edge
Normal speed
Original
trailing edge
Deceleration
Stop
Shift
speed
Shift distance
[1] [2] [3] [4]
[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.
2. Backward Movement after Image Scan
After image scan, the carriage moves back to the contact image sensor (CIS) shading position at the constant speed (123
mm/sec).
■ Contact Image Sensor (CIS)
● Outline
The original is exposed to light and read using the contact image sensor (CIS) to read the image on a line-by-line basis.
2. Technical Explanation
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