Ricoh G104 Service Manual page 560

Process Control
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.
Toner refresh mode supplies new toner, because there is old toner in the developer after
printing many pages that have low image coverage.
During toner refresh mode, the machine does the following:
1. Mixes the developer for 5 seconds.
2. Performs an engine free run, which simulates printing of 10 sheets of A4
size paper with the image data (2 by 2) and normal toner supply.
3. Mixes the developer for 10 seconds.
G160/G161
CÓPIA NÃO CONTROLADA
6-10
CÓPIA NÃO CONTROLADA
SM