Functions; General Description; Recovered Toner Supply Mechanism - Toshiba e-STUDIO 200L Service Manual

12.2 Functions

12.2.1

General description

1) Toner cartridge drive unit / Toner cartridge installation switch
The toner cartridge is filled with toner. The toner motor drives the cartridge to supply the toner to the
developer unit.
The toner cartridge installation switch detects whether the toner cartridge is installed.
2) Developer unit
- Developer material
The developer material is made of a mixture of the carrier and toner.
The carrier is an electrical conductive ferrite whose size is 30 µm to 100 µm. The toner is a resin
particle whose size is 5 µm to 20 µm.
The developer material needs periodic replacement since its quality is deteriorated by long use.
- Mixers-1, -2 and -3
Friction is generated by mixing the developer material. The carrier is charged to (+) and the toner
to (–), and the image is formed on the drum surface by the static electricity caused by the friction.
The mixer-3 is mounted exclusively for the recovered toner to mix it with sufficient time.
- Developer sleeve (Magnetic roller)
This is an aluminum roller with a magnet inside. The magnet works to absorb the developer
material and forms the magnetic brush. The magnet is fixed and only the sleeve around is
rotated. This rotation makes the magnetic brush of the developer sleeve sweep over the drum
surface and perform development.
- Doctor blade
Doctor blade controls the amount of the developer material transported by the developer sleeve
so that the magnetic brush of the developer material contacts with the drum surface properly.
- Auto-toner sensor
The carrier and the toner (toner density) in the developer material should be always fixed to a
certain ratio to output normal images. The auto-toner sensor detects the inclusion ratio of the
toner in the developer material by using a magnetic bridge circuit. When the quantity of toner
becomes insufficient, the toner motor is driven to supply the toner from the toner cartridge.
-

Recovered toner supply mechanism

The recovered toner transported from the drum cleaner is transported into the developer unit by
the paddle and the toner recycling auger on the front side of the developer unit. The drive of the
toner recycling auger is transmitted by the mixer-3.
e-STUDIO200L/202L/230/232/280/282 DEVELOPMENT SYSTEM
12 - 2
June 2004 © TOSHIBA TEC