Development - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

2.5.7 Development

CARTRIDGE SENSOR
The CARTRIDGE SENSOR determines whether the each color of Toner
Cartridge mounted is new or old. With trickle developing, the used developer is
collected inside a separate chamber in the Toner Cartridge with the two
functions. A white reflecting seal is applied inside the collecting chamber.
When developer is collected it covers the reflecting surface so light is no longer
reflected.
The CARTRIDGE SENSOR is a reflecting photosensor that detects reflection
from the reflection chambers inside the various color Toner Cartridges, and
determines that no developer has been collected when there is reflection (in
other words, the Toner Cartridge is new), or that developer has been collected
when there is no reflection (in other words, the Toner Cartridge is not new).
The CARTRIDGE SENSOR also detects reflection from each color Toner
Cartridge, and determines that the Toner Cartridge is mounted when there is
reflection, or that the Toner Cartridge is not mounted when there is no
reflection.
ROTARY SENSOR
Detects home position of the ROTARY FRAME ASSY. The home position is
the starting point for DEVE. Control. (For details, see 2.7.8 "DEVE. Control" in
this chapter.)
DEVELOPER ASSY Y, DEVELOPER ASSY M, DEVELOPER ASSY
C, DEVELOPER ASSY BK
The Developer Assy consists of the Auger, Magnet Roll, Trimmer Blade, and
Tracking Roll.
The Developer Assy contains 3 Augers: one that supplies toner from the
Toner Cartridge to the Developer Assy, one that mixes developer inside
the Developer Assy, and one that supplies developer inside the Developer
Assy to the Magnet Roll.
Operating Principles
The Magnet Roll attracts carrier (which is a magnetic material) by force of
magnetism, forms a uniform layer of developer, and supplies toner to the
drum.
Trimmer Blades are arranged at positions having a certain clearance with
the Magnet Roll, and form a uniform layer of developer on the Magnet Roll.
The Tracking Roll maintains a certain distance between the drum and
Magnet Roll.
TONER CARTRIDGE Y, TONER CARTRIDGE M, TONER
CARTRIDGE C, TONER CARTRIDGE BK
Toner Cartridges charge toner (including carrier) to be supplied and collect
developer (mainly carrier) with reduced electrification characteristics.
Revision C
2-32