Step 5: Vd, Vb, Vl Selection And Vref Adjustment; Toner Supply Control; Toner Supply Control Modes - Ricoh G104 Service Manual

PROCESS CONTROL
Step 5: V , V , VL Selection and V
D B
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
the development gamma detected by process control will be the value stored in
SP3-561-001 to -004 (do not adjust in the field unless told to do this).
After that, the transfer belt cleaning unit cleans the transfer belt.

6.2.4 TONER SUPPLY CONTROL

Toner Supply Control Modes

This machine has four toner supply control modes. They are selected with SP 3-
301-001 to –004.
1. Fixed supply mode
This mode is used when the TD sensor becomes defective. The amount of
toner supply can be adjusted with SP3-302-001 -004 if the image density is
incorrect (the default setting is 5%).
2. Proportional control mode 1 (Pixel)
This mode is used when the TD sensor becomes defective. Only the pixel
count is used to control toner supply. The amount of toner supply can be
adjusted with SP3-306-001 to -004.
3. Proportional control mode 2 (TD sensor)
This mode is used when the ID sensor at the center becomes defective. Only
the TD sensor is used to control toner supply. The amount of toner supply can
be adjusted with SP3-306-005 to -008.
G104
CÓPIA NÃO CONTROLADA
Adjustment
REF
(toner density target) at the same time. As a result,
REF
6-12
CÓPIA NÃO CONTROLADA
M/A
Target
M/A
Vk B
0
Development
Potential
G105D947.WMF
SM