Toshiba e-STUDIO281c Service Manual page 98

- About developer material
The developer material is comprised of a mixture of toner and carrier. The toner is charged to a
negative polarity and the carrier to a positive polarity, due to the friction with each other caused
by mixing.
Toner: Mainly consists of resin and coloring.
Carrier: Consists of ferrite, and over its surface resin coating to provide consistent frictional
electrification.
Note:
If the developer material is used for a long period of time (beyond its normal life span), toner will become
caked onto the carrier.
↓
The performance of the carrier is lowered.
Result:
1. Image density is lowered.
2. Toner scattering occurs.
3. Background fogging occurs.
Solution: Replace the developer material.
e-STUDIO281c/351c/451c COPY PROCESS
Carbon
( 5-10% )
5-13 µm
Resin ( 90-95% )
[ Toner ]
Fig.3-13
Toner
Where toner is caked, no
frictional electrification
occurs.
Fig.3-14
3 - 8
Ferrite
30-100 µm
[ Carrier ]
Carrier
June 2005 © TOSHIBA TEC