High-voltage power supply
The high-voltage circuit produces the voltage biases that are applied to the primary charging roller,
the developing cylinder, the transfer charging roller, the fuser sleeve, and the pressure roller.
Figure 5-5 High-voltage power supply circuit
The primary charging voltage (bias) applies a uniform negative charge to the photosensitive drum in
the print cartridge. Two types of primary charging bias are used: the primary charging dc negative
voltage and the primary charging ac bias. The high-voltage circuit on the power supply generates
both biases. These biases are superimposed on one another and then applied to the primary
charging roller, which transfers the biases to the drum. The laser/scanner assembly generates the
Engine-control system 91
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