12

12.2  Functions

(1)Toner cartridge drive unit / Toner cartridge detection 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 detection switch detects whether the toner cartridge is installed.

(2)Developer unit

(a)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 30µm to 100µm. The toner is a resin particle whose size is 5µm to 20µm.

The developer material needs periodic replacement since its quality is deteriorated by long use.

(b)Mixers-1 and -2

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.

(c)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.

(d)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.

(e)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.

e-STUDIO350/352/353/450/452/453

12 - © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved

DEVELOPMENT SYSTEM

 

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Toshiba 452, 453, 350, 353 service manual Functions
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350, 353, 453, 452 specifications

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