124 Theory of operation ENWW
High-voltage power supply circuit
This circuit applies a bias to the primary charging roller, the developing cylinder, the developing
blade, the primary and secondary transfer charging rollers, and the pressure roller.
The DC controller controls the high-voltage power supply circuit and generates the high-voltage
bias. See, Image formation system for the details on image formation.
Figure 5-14 High-voltage power supply circuit
Primary charging bias generation
The primary charging biases (PR11, PR12, PR13, PR14) are used to charge the photosensitive
drum surface with negative potential to prepare for image formation.
They are the DC negative biases, PR14 for K (black) and the rest for colors (Y, M, C), generated in
the primary charging high-voltage generation circuit in the high-voltage power supply circuit. The
high-voltage power supply circuit applies these biases to the primary charging rollers in each
cartridge at the specified time.
To Next Page
Loading...
