Dell 3130cn - Color Laser Printer, Service Manual

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Chapter 6 Principles of Operation
Version 1 2007.12.28
1.3 Description of Printing Process Techniques
1.3.1 Charging with electricity
In the charging process, the drum surface rotating at a constant speed is charged uniformly with
negative electricity by the discharge from BCR (Bias Charge Roll).
This process is performed in parallel for yellow, magenta, cyan and black colors.
- The BCR is kept in contact with the drum and rotates following the rotations of the drum.
BCR is a conductive roll, receives discharge voltage from the High Voltage Power Supply (HVPS)
and discharges a negative DC voltage.
- The drum surface is uniformly and negatively charged with DC bias voltage.
The drum surface is a photoreceptor (which is an insulator in the dark and a conductor in the light)
and the drum inside is composed of a conductor.
- The Cleaning Roll is a sponge, which contacts with the BCR to catch the toner.
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