Canon Color Image Reader-F1 Service Manual page 17

2
Technology > Controls (Reader) > Controls > IDirt Sensor Control
[Particulars of control]
• At the end of a job (dust detection)
The Reading Sensor detects presence/absence of dust at the reading position A, B, and C
in that order, and the position where dust is least present becomes the reading position for
the next job..
• At the start of a job (dust bypass)
Like the time of completion of a job, presence/absence of dust is detected at all positions
(A, B, and C in that order). The position where dust is least present is used as the reading
position and reading starts.
C B
2 Technology > Controls (Reader) > Controls > IDirt Sensor Control
A
F-2-5
• Between sheets
The Scanner Unit does not move.
It reads the original using the position determined at the end or start of a job; however, if the
presence of dust is still detected at the position, the machine will execute image correction.
0.5 mm 0.5 mm
C B A
Scanning Glass
Service Mode
• COPIER > OPTION > IMG-RDR > DFDST-L1
used to adjust the dust detection level between sheets
• COPIER > OPTION > IMG-RDR > DFDST-L2
used to adjust the dust detection level at the end of a job
2-6
F-2-6
2-6