Ricoh B246 SERIES, Manual, Page: 154 / 268

154
154
ID Sensor Calibration
„
Adjusts the output when light is reflected
from the bare drum to 4.0
±
0.2V
„
This is known as V
SG
Drum,
No Toner
Image Density
Sensor
Sensor Output
4.0 ± 0.2 V
Reflected
Light
Service manual, section 6.8.11, ID Sensor Calibration
ˆ
The ID sensor is used for toner supply control.
ˆ
The response of the sensor to the bare drum is calibrated during auto process
control.
¾
The intensity of light shining on the drum from the sensor is adjusted until the
output is 4.0
±
0.2V
ˆ
At certain intervals during the day (for details, see Development and Toner Supply),
the output is measured and compared with the reading from a standard sensor
pattern. This controls the toner supply.
¾
During toner supply control, the sensor is not calibrated; this only happens
during Auto Process Control.
ˆ
If the ID sensor output cannot be adjusted to within the standard, the TD sensor
becomes the only control for the toner density.
ˆ
SP 2967: Also, the ID sensor can be disabled. In some environments, such as
places where there is an abnormal amount of ammonia in the air, the ID sensor is
unreliable. See the SP table for details.