Canon Color imageRUNNER C5180 Series, Руководство по обслуживанию

Страница: 177 / 851

Chapter 6
6-10
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.
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:
F-6-14
Reader controller
PCB
Motor
driver
Interface PCB
+24V/15V
J306
A
A*
B
B*
CPU
1
2
3
4
6
5
J308
J307 J202
J203
Scanner
motor
M501
[1]
1 Scanner motor control signal
Start position
Acceleration
Image leading edge
Normal speed
Image trailing edge
Deceleration
Stop
Shift
speed
Shift length
[1] [2] [3] [4]
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.
(if black-and-white/SEND mode, twice as fast as in full-color mode)
4. Deceleration Zone: past the image trailing edge, immediately decelerates and stops.