Canon Color Image Reader - L1 Service Manual page 12

2
Technology
Basic confi guration
Function confi guration
Following is the list of functions.
Reader unit Scanner unit
Reader controller PCB
Scanner drive
Dust detection
Main controller PCB
Magnification change
2
Technology
Image scanning
A/D conversion
Original size detection
Image processing
Parts confi guration
Followings are the positions and names of main confi guration parts.
Reader controller PCB
(PCB1)
DADF
open/closed
sensor 2
DADF
(SR3)
open/closed
sensor 1
(SR1)
Scanner unit
exhaust fan (FM1)
Scanner unit
home position sensor
(SR2)
Scanner unit
Component part Symbol
Scanner motor M1 2 phase pulse motor: pulse control
Scanner unit exhaust fan FM1 Exhaustion of scanner unit
Scanner unit cooling fan FM2 Cooling of scanner unit
DADF open/closed SR1 DADF open detection (DADF is detected at 5 degree)
sensor 1
Scanner unit HP sensor SR2 Scanner unit HP detection
DADF open/closed SR3 DADF open detection (size detection timing is detected
sensor 2 when DADF is open at 25 degree.
Original size sensor 1 CF1 Size detection in sub scanning direction (AB type)
Original size sensor 2 CF2 Size detection in sub scanning direction (INCH type)
Scanner unit --- Image reading, analog image processing
Reader controller PCB PCB1 Control of entire reader, digital image processing
Scanner motor (M1)
Original size sensor 2
(CF2)
Original size sensor 1
(CF1)
Scanner unit
cooling fan (FM2)
Function/specifi cation
2-1
2-1