Toshiba 4580, Service Manual

Page: 53 / 379

Mar. 1999 © TOSHIBA TEC 3 - 5 6570/5570 COPYING PROCESS
Note:
If the developer material is used for long periods
(beyond its normal life span), toner will become
stuck to the carrier.
↓
The carrier’s (charging) performance is lowered.
Result: 1. Image density is lowered.
2. Toner scattering occurs.
3. Fogging occurs.
Solution: Exchange the developer material.
•
Magnetic roller
- Magnetic brush development -
The South and North poles are arranged, as
shown in the figure on the right inside the
magnetic roller. The developer material con-
tacts the drum forming a brush.
This is caused by the lines of magnetic force
between the South and North poles.
Lines of magnetic force
Magnetic roller
Drum
Toner
Carrier
Where toner has settled,
no frictional electrifica-
tion occurs.
N
S
S
rier material. Toner, which has a minus (nega-
tive) charge, adheres to the carrier material
and producing what is commonly referred to
as “developer.”
Toner is a material mainly made with plastic
and carbon materials.
Carrier is ferrite beads with a coating layer
for the reason of the stabilization of the fric-
tional charge with toner.