•Switching of developer bias polarity

With the area which has no negative charge, background fogging is decreased by switching

the bias to the positive polarity (approx. +150 V).

Carbon

 

(5-10%)

3

•Developer material

The developer material consists of a mixture of the toner and carrier. The toner is charged to the negative polarity and the carrier to positive polarity due to the friction with each other caused by mixing.

Toner : Mainly consists of the resin and carbon.

5-20 µm

Resin (90-95%)

[Toner]

Ferrite

30-100 µm

Carrier : Consists of the ferrite and resin coating on its surface to provide consistent

frictional electrification.

[Carrier]

Fig. 3-210

Note:

If the developer material is used for a long time (beyond its normal life span), the toner is caked onto the carrier.

The charging performance of the carrier is low- ered.

Symptom : 1. Image density is lowered.

2.Toner scattering occurs.

3.Background fogging occurs.

Solution : Replace the developer material.

Toner Carrier

No frictional electrification occurs on

the area where the toner is caked.

Fig. 3-211

•Magnetic roller

-Magnetic brush development -

The south and north poles are arranged inside the magnetic roller as shown in the right figure. The developer material forms a brush-like fluff which contacts the photoconductive drum sur- face.

This is caused by the magnetic force lines be- tween the south and north poles.

© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved

Magnetic roller

3-

04/01

Photoconductive drum

Magnetic force

Nline

S

S

 

Fig. 3-212

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

COPY PROCESS

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Image 87
Toshiba 353, 452, 453, 350 service manual 30-100 µm
Page 86 Page 88

350, 353, 453, 452 specifications

The Toshiba 452, 282, and 352 models represent a significant leap in multifunction printing technology, designed for office environments that prioritize efficiency, reliability, and advanced features. These models are part of Toshiba's commitment to innovation and sustainability, emphasizing quality output while reducing environmental impact.

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In summary, the Toshiba 452, 282, and 352 models are versatile multifunction printers that offer a blend of speed, quality, and user-friendly features. Their commitment to sustainability and security makes them ideal choices for modern office environments looking to enhance productivity and efficiency.
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