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12 February 1992
1.3 V
PATTERN CONTROL
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1.3.1 Overview
(V)
Drum
residual
voltage
Copy volume
During the OPC drum's life, drum residual voltage gradually increases due to
electrical fatigue. This may cause dirty backgrounds on copies. The V sensor
is used to avoid this problem.
The V sensor is located on the drum unit, on the same frame as the ID
sensor. The ID sensor is located on the non-operator side and the V sensor
is on the operator side.
The CPU checks the drum residual voltage through the V sensor by directly
sensing the V
pattern on the drum surface. This V
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performed after the drum initial setting (SP mode #66). After this, the CPU
will do one V
pattern detection every 200 copies for the next 2,000 copies,
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and every 1,000 copies after that. Also when V
Drum Temperature Control) is applied and the drum temperature goes over
25°C, this detection is performed.
According to the data of the V
correction to the grid bias voltage and the development bias voltage.
(V)
Drum
potential
data correction (See 1.5
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pattern detection, the CPU applies V
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2-7
PROCESS CONTROL
Light intensity
pattern detection is
R
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