Introduction - Ricoh FT7770 Service Manual

30
April, '89
DEVELOPMENT UNIT

1. Introduction

When the development motor turns on, the paddle roller and development
roller sleeve start turning.
ports it to the development roller. Then, the permanent magnets attract the
developer onto the development sleeve and form it into a magnetic brush on
the sleeve.
When the rotating sleeve carries the developer past the doctor blade, the
blade trims the developer brush.
Shortly after that, the trimmed developer brush contacts the selenium drum,
and the positively charged latent image on the drum attracts the negatively
charged toner mixed in the developer.
positive bias to prevent toner from being attracted to the non-image areas
on the drum, which have a slight positive charge.
After turning about 100 degrees more,
developer to fall back to the developer
tion is very weak at this point.
The paddle roller picks up developer and trans-
The development sleeve receives a
the development sleeve allows the
tank, because the magnetic attrac-
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