Toner Supply Control - Ricoh G190 Service Manual

Process Control

6.2.3 TONER SUPPLY CONTROL

Toner Supply Control Modes
This machine has four toner supply control modes. They are selected with SP 3301-1 to 4.
(Default: SP3301 - 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%).
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 SP 3306
1 to 4.
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 SP 3306 5 to 8.
4. Hybrid control mode
This is the default toner supply control mode. The TD sensor or the pixel count are
used in this mode.
If the image coverage ratio is less than the value of SP 3701 2 to 5, pixel count is
used.
If the image coverage ratio is more than the value of SP 3701 2 to 5, the TD
sensor is used.
But, if SP 3701 1 is "off", then the TD sensor is always used. The default setting for
this SP is "off". Because of this, pixel count is not used.
The amount of toner supply can be adjusted with SP 3306 9 to 20.
The TD sensor is in the PCU. If the TD sensor becomes defective, the technician must
replace the PCU. But if this is not possible, the technician can change the toner supply
mode with SP 3301 1 to 4.
Low Image Coverage
After process control, toner refresh mode is done (this can be switched off with SP3721-1).
It is only done if the percentage of pages (after the previous process control) that had
low image coverage is more than the value of SP3721-2.
SP 3701-2 to-5 control the limits that the machine uses to detect if the image coverage
is low.
G190 6-12 SM