Ricoh DD5450 Field Service Manual page 106

Chapter 3 Scanner Section
1
(2) Document Cover Open/Close Sensor
Description
The document cover open/close sensor detects opening and closing of the document cover (or ADF
if the ADF is installed).
Blue
3
Light green
2
Red
1
Operation
Sensor is photointerrupted with the document cover closed, The photointerrupter rotates as the
document cover is opened and sensor is photopassed.
● When the document cover is closed
Document cover open/close sensor : photointerrupted
CLOSE
Photointerrupting
104
20 CN4-22
21 -23
-24
22
● When the document cover is opened
Document cover open/close sensor : photopassed
Fulcrum
OPEN
Paper present: 0V
No paper: 5V
Main PCB unit
Fulcrum
Photopassing