Ricoh DD 5450, Field Service Manual, Page: 105 / 403

３
103
Chapter 3 Scanner Section
15
14
13
-18
-17
CN4-16
1
2
3
19
18
17
-21
-20
CN4-19
1
2
3
Description
● Sensor 1 detects the optical system home position when ADF is not used.
● Sensor 2 detects the optical system home position when ADF is used.
3. Function of Parts and Circuit
Circuit
Operation
● Standard (ADF not attached)
●
With ADF attached
Slider Limit sensor
Main PCB unit
Photopassing: 0V
Photointerrupting: 5V
Photopassing: 0V
Photointerrupting: 5V
Shading plates are attached on slider A of the optical system. The position where sensor 1 is
shaded becomes the optical system home position when S3-ADF is not attached.
The position where sensor 2 is shaded becomes the optical system home position when S3-ADF
is used.
Slider limit sensor 1
(scanner home position) Slider limit sensor 2
(S3-ADF home position)
Shading plate
Slider A
Main PCB unit
Shading
plate
Slider A
Shading plate
(1) Slider Limit Sensors (Home position sensor)
Shading plate
Red
Yellow
Blue
Red
Yellow
Blue
Orange
Red Red
Blue
Orange
Blue
1