Ricoh B246 SERIES, Manual, Page: 146 / 268

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Process Control Components
„
Toner Supply Control
z
TD sensor
z
ID sensor
z
Image pixel count
„
Latent Image Control
z
Grid voltage
z
Drum potential sensor
z
Laser diode power
z
Development bias
ˆ
In this machine, process control consists of the following.
¾
Toner supply control, controlled by the TD sensor, the ID sensor, and the
image pixel count. For details, see the Toner Supply section of the course.
¾
Latent image control (also called ‘drum potential control’), using the drum
potential sensor, charge corona grid voltage, development bias, and laser
diode power, to correct drum potential to compensate for the points listed in
the service manual.
ˆ
This section of the course will mainly deal with latent image control. The
Development and Toner Supply section of the course handles toner supply.
¾
However, Auto Process Control has some bearing on toner supply, and this
will be discussed as we get to it.
ˆ
Normally in digital copiers, there is no drum potential control. However, in this
machine, the high process speed can lead to an unstable image density. Therefore,
drum potential control is used in this model.