Exit Sensor; Read Position Sensor - Panasonic UF-5500 Service Manual

6.12.3. Exit Sensor

This sensor detects whether the recording paper exits or not.
When there is a recording paper at the position of the sensor, the input signal of IC300-AD20pin becomes low level.
When there is no recording paper at the position of the sensor, the input signal of IC300-AD20pin becomes high level.
[Exit sensor]
Shelter Plate

6.12.4. Read Position Sensor

This sensor detects the front edge of the document.
When the front edge of the document is detected, the shelter plate closes the sensor light.
So the photo-transistor turns off and the input signal of IC300-AD22pin becomes high level.
When the front edge of the document is not detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on and the input signal of IC300-AD22pin becomes low level.
[Read position sensor]
A document exists
No document
CN53
CN65
R54
2 2
PS50
3
3
Toner Board
Fuser Board
A paper exists
No papers
CN56 CN700
R52
Shelter Plate 1
1
PS53
2
2
ADF
Board
Photo-transistor
OFF
ON
+3.3V
CN508
CN64
2 2
+3.3V
R506
1
1
Signal (IC300-AD20pin)
Low level
High level
+3.3V
+3.3V
R706
R703
C704
Signal (IC300-AD22pin)
High level
Low level
55
IC300
R510
AD20
C508
Main Board
IC300
AD22
Main Board
UF-5500 / 4500