Toner Supply Control; Toner Supply Control Modes - Ricoh G133 Service Manual

6.2.5 TONER SUPPLY CONTROL

Overview
Toner supply control determines how long the toner supply clutch turns on. This determines
the amount of toner supplied. This is done before every development for each color.
Toner supply control uses the following factors:
Density of the toner in the developer (detected by the TD sensor) - V
Pixel count: Determines how much toner was used for the page
The image density is kept constant by adjusting the density of toner in the development unit.
At the same time, it accommodates changes in the development conditions through the
potential control mechanism. Environmental changes and the number of prints made are
also used in the calculation.
The amount of toner supplied is determined by the 'on' time of the toner supply clutch. The
total 'on' time for each toner supply clutch is stored in the memory chip for the relevant
toner cartridge. The machine supplies the calculated amount of toner for each color.

Toner Supply Control Modes

This machine has three toner supply control modes. You can select them with SP3-044-1
to -4.
1. Fixed supply mode
This mode is used when the TD sensor becomes faulty. You can adjust the amount of
toner supply with SP3-401-1 to -4 if the image density is incorrect (the default setting is
5%).
2. PID (Proportional Integral Differential) control mode (Fixed V
This mode is used when the ID sensor becomes faulty. Only the TD sensor is used to
control toner supply. The machine uses the V
3. PID (Proportional Integral Differential) control mode
This is the default toner supply control mode. The TD sensor, ID sensor, and pixel
count are used in this mode. V
The machine automatically changes the toner supply mode to fixed supply mode if the TD
sensor is broken. However, the supply amount will be 70% of the normal fixed value to
prevent too high image density.
The machine automatically changes the toner supply mode to PID control mode (Fixed
Vtref) if the ID sensors are broken.
SM
that is stored in SP3-222-1 to -4.
TREF
is adjusted by process control.
TREF
6-13
Process Control
, V
REF T
)
TREF
G133