Overview

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Dirt Sensor Control
Overview
The machine changes the original read point or executes image correction depending on the presence/absence of dust on the stream reading glass or the platen roller of the ADF to prevent the dust from showing up in the output. These operations are carried out only when the ADF is in use and, in addition, is closed.
[Control timing]
At the end of a job
Between sheets (for each reading of a sheet)
At the start of a job (only when any of the following conditions is true.)
Dust detected at all points of detection at the end of the previous job
Dust detection failed to end normally at the end of the previous job (e.g., ADF opened)
[Particulars of control]
At the end of a job (dust detection)
CCD checks the light reflected by the surface of the platen roller of the ADF at the read point to detect the presence/absence of dust. Presence of dust is detected at points A, B, and C in this order. The point where least dust is detected will be used as the read position for the next job. The point selected here will be used as the read position for the next job.
At the start of a job (dust bypass)
Presence of dust is detected at points A, B, and C in this order in the same manner as at the end of the job. Read will take place at the point where least dust is detected.
Between sheets
The machine does not move CCD.
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.
Service Mode
(Lv1) COPIER > OPTION > IMG-RDR > DFDST-L1
(used to adjust the dust detection level between sheets)
(Lv1) COPIER > OPTION > IMG-RDR > DFDST-L2
(used to adjust the dust detection level at the end of a job)