Canon F-1, Service Manual

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Technology > Controls > Reader > Scanner drive control
Technology > Controls > Reader > Scanner drive control
Controls
Reader
■ Scanner drive control
●
Configuration of drive system
Following is the parts configuration related with scanner drive system.
Reader controller PCB
HP
ACOM,BCOM
Scanner home position
sensor (SR2)
Scanner unit
Scanner motor (M1)
Component parts Symbol Function
Scanner motor M1 Control of the drive/stop, direction and speed of motor rotation
Scanner unit HP sensor SR2 Scanner unit HP detection
Scanner unit - Image reading, analog image processing
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● Scanner motor control
Following is the control system configuration related with the scanner motor control.
Motor driver on the reader controller PCB controls the drive/stop, direction and speed of
scanner motor rotation in accordance with the signals from CPU.
1) Backward operation after image scanning
Backward operation after image scanning until shading position of scanner unit is controlled
by 468 mm/sec regardless of color mode.
2) Forward operation at image scanning
At image scanning, the following motor control controls the scanner unit operation.
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.
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