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Dirt is detected when a document passes through, so the alert will not disappear until reading of the next document begins, even after the sheet-through exposure glass cleaning is performed.
If dirt is detected not on the sheet-through exposure glass but on the background guide plate, the alert will not disappear even if the glass is wiped.
The time required for the first copy is slightly (almost imperceptibly) longer.
The detection threshold value can be changed using SP4-020-002 (Dust Check Dust Detect:Lvl). (The larger the value is, the smaller the dirt particles that can be detected become.)
It is prohibited to change the setting of SP4-020-003 (Dust Check Lvl Dust Reject:Lvl).
Difference between Non-contact Transport and Contact Transport in DF Scanning
Transport Method | Non-contact Transport | Contact Transport |
Descriptions |
Because of the film attached to the glass, the original doesn’t contact the glass. |
While passing, the original contacts the glass. |
Merit | It almost never causes stripes on the image that arise from foreign substances transferring from the original to the glass. | It almost never causes stripes on the image that arise from dust on the glass, because the glass is cleaned by contact with the transported original. |
Demerit | Compared with the contact method, stripes on the image caused by dust occur more often. | Compared with the non-contact method, stripes on the image caused by foreign substances transferred from the surface of an original to the glass occur more often. |
Detailed Descriptions
Detailed Descriptions
Detailed Descriptions
Scanning
Transport Method | Non-contact Transport | Contact Transport |
Aim | To improve prevention of stripes in the image caused by sticky foreign substances. | Considering the target users of this machine, it’s important to improve prevention of stripes caused by dust in the path |
Note | 1. Be sure to replace the sheet-through glass with the film attached on the glass. 2. When you attach the film on the glass, you need to keep the left scale attached on the glass in order to fix the location of the film.*1 3. You can change the method (contact method to non-contact, or vice versa) by replacing some parts.*1 | - |
*1: For details, page 6-309 "Vertical Streaks on Copies due to Scanning Problems".
