Color Development; Overview; Bias Control; Base Bias For Color - Ricoh FT4430 Service Manual

COLOR DEVELOPMENT

1. Overview

This copier has mono-color copying capability in red, green, and blue as well
as standard black. To change colors, the development unit must be replaced.
To detect which color is used, an actuator is mounted on the development
unit. Since the reflectivity varies with the color of the toner, the toner end
detection system uses a mechanical detection system instead of an ID sensor
detection system.

2. Bias Control

Due to the differences in the characteristics of black and color toner, the CPU
changes the bias control when it detects a color development unit.

3. Base Bias for Color

Bias for ID Sensing
4.
Since the reflectivity of color toner varies with the color type, the ID sensor is
used only to detect overtoning. Just as for black copies, the image density is
sensed once in 10 copy cycles.
VT
2-33
16 April '88