Toner Supply Control - Ricoh G-P2 Service Manual

G160 Service Manual 23-Feb-06
Step 4: Toner Amount Calculation
2
The quantity of toner on the transfer belt (M/A, mass per unit area, mg/cm ) is calculated for
each of the 10 gradations of the sensor pattern. To do this, the machine uses the ID sensor
output value from each gradation of the pattern.
Step 5: V , V , V Selection and V Adjustment
D B L REF
The machine makes a plot of the 10 values of M/A against the development potential that was
used to make each of the gradations. Then it makes a line through the 10 points.
Then, it finds the development potential that is necessary to put the 'target M/A' of toner on
the OPC.
This development potential is then used to find the best values of development bias, charge
roller voltage and laser power for the machine in its current condition. To do this, it refers to a
table in memory.
The machine also adjusts V (toner density target) at the same time. As a result, the
REF
development gamma detected by process control will be the value stored in SP 3561 1 to 4
(do not adjust in the field unless told to do this).
After that, the transfer belt cleaning unit cleans the transfer belt.

Toner Supply Control

Toner Supply Control Modes
This machine has four toner supply control modes. They are selected with SP 3301 1 to 4.
1. Fixed supply mode
This mode is used when the TD sensor becomes defective. The amount of toner supply can
be adjusted with SP 3302 1 -4 if the image density is incorrect (the default setting is 5%).
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