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Chapter 6 Principles of Operation
Epson AcuLaser C2900N
Revision B
Confidential
1.3 Description of Printing Process Techniques
1.3.1 Charge
In the charging process, the drum surface rotating at a constant speed is charged uniformly with nega-
tive electricity by the discharge from BCR (Bias Charge Roll).
This process is performed in parallel for yellow, magenta, cyan and black colors.
- BCR (Bias Charge Roll)
The BCR is kept in contact with the drum and rotates following the rotations of the drum. The BCR
is a conductive roll that uniformly and negatively charges the drum surface with the negative volt-
age applied by the HVPS.
-Drum
The drum surface is uniformly and negatively charged with DC bias voltage.
The drum surface consists of a photoreceptor (which is an insulator in the dark and a conductor in
the light) backed with a conductor.
- Cleaning Roll
The Cleaning Roll contacts with the BCR to remove the toner from it.
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