Canon F1 Service Manual page 30

2
Technology > Basic configuration > DADF > Scanner Unit
■ Scanner Unit
For exposure and scanning of original, this equipment uses an integrated scanner unit
consists of the LED, the mirror, the lens and the reading sensor.
The light emitted from the LED is reflected to the original, and then received by the reading
sensor through the 3 turndown mirrors and the 4 free curved mirrors.
a. LED lamp unit
The LED lamp unit emits light from 2 boards of LED lamp PCB (LED chip: 54 pc per board).
The emitted light is reflected to the original through the reflecting plate.
b. Free curved mirror
The scanner unit has 3 turndown mirrors and 4 free curved mirrors.
The free curved mirror is a mirror symmetric to the light shaft in main (horizontal) scanning
direction while dissymmetric in sub (vertical) scanning direction.
c. Reading sensor
The reading sensor performs scanning of image per image line.
The reading sensor has 4 lines (B/W, R, G, B), using 1 line (B/W) when scanning black/white
image and 3 lines (R, G, B) when scanning color image.
Error code
E301 (insufficient light intensity)
-0101 The light intensity during back side shading is lower than the standard level
2 Technology > Basic configuration > DADF > Scanner Unit
DADF LED Lamp
PCB (Left)
DADF LED Lamp
PCB (Right)
DADF Scanner
Unit PCB
Mirror
No.4
Mirror
No.2
Mirror
No.5
Lens
2-17
LED (light source)
Mirror
No.3
Mirror
No.1
CCD
[ Red (R) line]
[ Greeen (G) line]
[ Blue (B) line]
[ Black & white (B / W) line ]
F-2-39
2-17