HAKUBA 26PPM Laser Printer - Base Engine Technical Manual
13-5
Version 1.0
Principles of Operation
1. Charge
The Bias Charge Roll (BCR) places a uniform negative electrostatic charge on the drum surface. The
drum surface is made of a photoconductive material that holds the electrical charge as long as the
drum remains in darkness. Light striking the drum discharges the surface charge.
The BCR is a conductive roll that is positioned slightly above the surface of the drum. The PWBA
HVPS supplies the BCR with two voltages; a negative DC charge voltage and an AC discharge voltage
The negative DC voltage creates a uniform negative charge across the surface of the drum. The AC
voltage removes any residual DC charge that was left from the previous print cycle.
Figure 3. Side view block diagram of the drum charge process
Summary of Contents for b 6100
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