57
UF-5500 / 4500
6.12.7. Document Sensor
This sensor detects whether a document is set in ADF or not.
When a document is set in ADF, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC300-AF23pin becomes high level.
When a document is not set in ADF, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC300-AF23pin becomes low level.
6.12.8. Top Cover Sensor
The Switches detect whether the top cover is open or closed.
When the top cover is closed, the switches turn ON, and the input signal of IC300-W25pin becomes a low level.
When the top cover is open, the switches turns OFF, and the input signal of IC300-W25pin becomes a high level.
Photo-transistor
Signal (IC300-AF23)
document exists
OFF
High level
No document
ON
Low level
Switch
Signal (IC300-W25pin)
Open
OFF
High level
Close
ON
Low level
Shelter Plate
PS54
IC300
3
1
3
1
CN700
R704
AF23
R705
+3.3V
DOC
Board
ADF
Board
3
1
3
1
Main Board
CN56 CN68 CN56
[Document sensor]
R53
C701
+3.3V
J56
IC300
CN505
1
R516
W25
Main Board
CN1
1
H.V.P.S
Q507
R517
SW1
8
8
+24V
+3.3V
[Top cover sensor]
Summary of Contents for UF-5500
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Page 248: ...248 UF 5500 4500 13 5 Test Chart 13 5 1 ITU T No 1 Test Chart...
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