Figure 1-5 High-voltage power supply circuits
DEVPRI DIS
TR
TRFRONT
FILM
FUSER
To primary charge roller
To developing roller
Cartridge
Fuser
Transfer roller
Static charge
eliminator
Pressure roller
Fuser film
Transfer front guide
Primary
charging bias
circuit
Developing
bias circuit
Transfer bias
circuit
Fuser bias circuit
Transfer front guide
bias circuit
Static charge
eliminatior
bias circuit
DC controller
High-voltage power supply
Table 1-12 High-voltage power supply circuits
Circuit Description
Primary-charging-bias generation The primary charging bias negatively charges the surface of the photosensitive drum to
prepare for image formation.
Developing-bias generation The developing bias adheres toner to an electrostatic latent image formed on the
photosensitive drum.
Transfer-bias generation The primary transfer bias transfers the toner from the photosensitive drum onto the
paper.
Static charge eliminator bias generation The static charge eliminator bias eliminates the electric charge on the back side of the
paper for stable paper feed and print quality.
Fuser bias generation The printer uses instant-on fusing. The fuser bias is DC positive for improved print
quality. The fuser bias circuit is located in the high-voltage power supply.
Fuser control
The DC controller and components in the fuser perform the following functions related to fuser operation:
14 Chapter 1 Theory of operation ENWW
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