Enlargement/Reduction - Canon imagePRESS C1 P Service Manual

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
J202
J203
CPU
1 Scanner motor control signal
F-5-13
- 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:
The machine uses the following scanning speeds to suit different modes;
Function
Copier
SEND

5.3.2 Enlargement/Reduction

5.3.2.1 Changing the Magnification in Main Scanning Direction
imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+
For main scanning direction in both copyboard and ADF modes, the image is read at 100%, and the magnification is varied by the main controller block.
5.3.2.2 Changing the Magnification in Sub Scanning Direction
imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+
For sub scanning direction in both copyboard and ADF modes, the image is read at 100%, and the magnification is changed by the main controller block.
In SEND mode, the reading size is switched between 100% and 50% depending on the selected resolution.
5.3.3 Controlling the Scanning Lamp
5.3.3.1 Overview
imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+
The scanning lamp is controlled for the following, with associated control mechanisms operating as follows:
1. Turning On and Off the Scanning Lamp
The scanning lamp is turned on or off by the drive signal (XE-ON) generated by the CPU of the reader controller PCB. When the signal is generated, the inverter
Interface PCB
+24V/15V
J308
J307
A
[1]
A*
Motor
B
driver
B*
Start position
Image leading edge
Acceleration
Shift
speed
[1] [2]
Shift length
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.
Mode
black-and-white
full-color
black-and-white
full-color
Scanner
motor
J306
M501
3
1
4
5
2
6
Image trailing edge
Normal speed
[3]
F-5-14
T-5-5
Stop
Deceleration
[4]
Scanning speed
234 mm/sec
234 mm/sec
468 mm/sec
234 mm/sec
Chapter 5
0012-9674
0012-9675
0012-9676
5-7