During Copying
To maintain good copy quality, the development bias changes depending on
the background density detected by the ADS sensor.
In full size mode when the user selects ADS, the CPU samples the ADS
sensor output across the original from 5 mm to 15 mm from the left scale
edge. The CPU takes the maximum ADS sensor output during the sampling
period and compares it with the ADS reference voltage (V
ADS
[pattern]; see
the previous page). Based on this comparison, the machine may adjust the
development bias to eliminate dirty background (see the Process Control -
ADS Correction section for details).
The sampling length of the ADS sensor output for the original differs
depending on the reproduction ratio because the scanner speed is different.
Sampling is performed on each copy. (If more than one copy is made of the
same original, sampling is only done for the first copy run.)
Note:
There is an optional extra ADS sensor for users who have copy
quality problems with certain types of red original. (See FSM page
3-24)
Maximum
ADS
Sensor
Output
A
B
[V]
A = 5
B = 20/M - 5 (mm)
M: Reproduction ratio
(0.5 ~ 2.0)
ADS
Voltage
from the
Original
60 mm
38 mm
A156/A160/A162 2-50 STM
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