Development; Overview - Gestetner A193 Service Manual

PCU (PHOTOCONDUCTOR UNIT)

4.5 DEVELOPMENT

4.5.1 Overview

[D] [G] [A]
[C]
[F]
[B]
[E]
A193D010-3.wmf
This copier uses a single roller development system.
The developer cartridge [A], which includes the developer, is located just
above the development unit section of the PCU. At installation, the developer
falls into the development unit. The mixing augers [B] transport the developer
and toner to the development roller [C]. Internal permanent magnets in the
development roller attract the developer to the development roller sleeve.
The development roller carries the developer past the doctor blade [D]. The
doctor blade trims the developer to the desired thickness and creates
backspill into the mixing mechanism. The development roller continues to
rotate, carrying the developer to the drum [E] where the latent image is
developed.
The toner density sensor [F], located on the side of the development unit,
measures the toner concentration in the developer. The humidity sensor [G]
located above the development cartridge measures the humidity level around
the drum.
(A193) 2-30 SM