Brother HL-3450CN Series, Service Manual

Page: 67 / 365

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS
4-14
3 Developing
The developing process means that an electrostatic latent image on the OPC belt is made
visible by depositing toner onto the exposed areas of the OPC belt.
(1) Structure of the Toner Cartridge (Refer to Fig.4-8 & 4.14.)
i) The toner cartridge is located as shown in Fig.4-8.
ii) Four toner cartridges are made available from the top to bottom in the order black,
yellow, magenta and cyan.
iii) Each color toner is loaded in the corresponding toner cartridge.
(2) Process of Developing (Refer to Fig.4-8, 4-14, 4-15, and 4-16)
i) Toner adheres to the developer roller of the toner cartridge.
Developing is processed by this roller contacting the OPC belt surface.
ii) The developer roller has been biased to the potential -DBV (V). Fig.4-15 describes
the relationship established between the potential of the toner, the potential -V
0
(V)
at the non-exposed area of OPC belt and the potential -VR (V) on the exposed area
of the OPC belt.
iii) Developing is processed by the toner adhering to the OPC belt due to the attraction
between the potential of the toner and the potential -VR (V) on the exposed area of
the OPC belt. A visible Toner image is formed on the OPC belt.
iv) No developing takes place on the non-exposed area because the potential of the
toner and that of the OPC belt is the same polarity and therefore repel each other.
Fig. 4-14
OPC belt
Developer roller
Toner
Toner cartridge