Theory of Operation Ver. 8.0 Jun. 2008
7. Scanner section (IR section)
2
3
2
Composition/Operation
7.3.2
Preventing stain on the DF original glass
A. DF original glass movement
• The reading lines will occur when DF original glass has stain. Shift mechanism for the DF
original glass is provided to avoid this trouble.
• The stand-by position for the DF original glass will be detected by the glass home sen-
sor.
• DF original glass will move back and forth by the original glass moving motor.
B. Details on DF original glass movement
• The DF original glass makes four different movements. Each of the four modes available
uses different glass movements.
• The following explains the four different movements and the four different modes.
(1) Normal movement performed each time after reading a sheet of original
• The DF original glass moves slightly back or forth every time after reading a sheet of
multiple originals. This changes the image reading position on the DF original glass and
prevents the repeated occurrence of lines in the sub scan direction due to the same stain
on the glass.
• The movement of the DF original glass is varied according to the specific model of the
reverse automatic document feeder installed, as each model has a specific rating of
scanning speed.
A00JT2C007DA
Original glass moving motor (M202)
Glass home sensor
(PS203)
2
The first original
The second original
DF original glass
Image reading position
Image reading position
Y107522-3 Theory of Operation
