Difference Between Non-Contact Transport And Contact Transport In Df Scanning - Ricoh MP C3004 Field Service Manual

7. Detailed Descriptions

Difference between Non-contact Transport and Contact Transport in DF Scanning

Transport
Method
Descriptions
Merit
Demerit
Aim
Note
*1: For details, page 1157 "Vertical Streaks on Copies due to Scanning Problems".
1204
Non-contact Transport
Because of the film attached to the
glass, the original doesn't contact the
glass.
It almost never causes stripes on the
image that arise from foreign
substances transferring from the
original to the glass.
Compared with the contact method,
stripes on the image caused by dust
occur more often.
To improve prevention of stripes in the
image caused by sticky foreign
substances.
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
Contact Transport
While passing, the original contacts 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.
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.
Considering the target users of this
machine, it's important to improve
prevention of stripes caused by dust in
the path
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