2C9
1-4-17
Maintenance
Description
item No.
U087 Turning the DP scanning position adjust mode on/off
Description
Turns on or off the DP scanning position adjust mode, in which the DP original scanning position is adjusted
automatically by determining the presence or absence of dust on the slit glass. Also changes the reference
data for identifying dust.
Reference
In the DP original scanning position adjust mode, the presence or absence of dust is determined by comparing
the scan data of the original trailing edge and that taken after the original is conveyed past the DP original
scanning position. If dust is identified, the DP original scanning position is adjusted for the following originals.
Purpose
Used to prevent appearance of black lines due to dust adhering in the original scanning position on the slit
glass when the DP is used.
Method
1. Press the start key.
2. Select the item to be set by lighting a copy exposure indicator using the copy exposure adjustment keys.
Copy exposure indicator Description
Exp. 1 Setting the mode on/off
Exp. 2 Setting the reference data for identifying dust
Setting the mode on/off
1. Select “on” or “oFF” using the zoom +/– keys.
Display Description
on DP scanning position adjust mode on
oFF DP scanning position adjust mode off
Initial setting: on
2. Press the start key. The setting is set.
Setting the reference data for identifying dust
Available only when the mode is turned on.
1. Change the setting using the zoom +/– keys.
Description Setting range Initial setting
Minimum density to be regarded as dust 10 to 95 35
Example
The figure indicates the density in 256 levels of gray (0: white, 255: black). When the setting is 35, data of
the level of 35 or higher is regarded as dust and data of lower level is regarded as the background (scan
data taken when there is no original).
2. Press the start key. The value is set.
Completion
Press the stop/clear key while a selection item is displayed. The indication for selecting a maintenance item No.
appears.
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