Controlling The Scanner Motor - Canon imagerunner C5180 Service Manual

Chapter 6

6.3.1.2 Controlling the Scanner Motor

The following shows the construction of the mechanisms used to control the scanner motor.
The motor driver on the interface PCB controls the rotation (activation/deactivation) of the scanner motor and
its direction and speed of rotation according to the signals from the CPU.
Reader controller
PCB
CPU
1 Scanner motor control signal
F-6-13
- Moving the Scanner in Reverse After an Image Scan
After an image scan, the No. 1 mirror base is moved in reverse to shading position at 234 mm/sec regardless
of the selected color mode.
- Moving the Scanner Forward for an Image Scan
When making an image scan, the No. 1 mirror base unit is moved by controlling the motor as follows:
Start position
Acceleration
Shift
speed
1. Acceleration Zone: accelerates to suit the selected mode
2. Approach Zone: moves for speed stabilization.
3. Image Read Zone: reads the image at a specific speed.
4. Deceleration Zone: past the image trailing edge, immediately decelerates and stops.
6-10
Interface PCB
J202 J308
J203 J307
[1]
Image leading edge
[1] [2]
Shift length
(if black-and-white/SEND mode, twice as fast as in full-color mode)
+24V/15V
A
3
1
A*
4
Motor
B
5
driver
2
B*
6
Image trailing edge
Normal speed
[3]
F-6-14
Scanner
motor
J306
M501
Stop
Deceleration
[4]