Control Method - Canon NP6251 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM

2. Control Method

The potential sensor inside the machine measures the dark area potential (V
the light area potential (V
measurements to enable a target value.
The light area potential (V
correction conditions, and the machine uses the measurement to determine the DC
component of the developing bias.
Tables 4-101 and -102 show how many times the machine measures and corrects
potential and when it initiates control.
Table 4-101 Measurement/Correction for Potential Control
4-2
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), and the machine makes corrections based on the
L1
) for developing bias is measured based on the
L2
Correction
V 8 (max.)
D
V 8 (max.)
L1
V 0
L2
Mode
Text mode • Once every power-on.
• Once while making the
first copy between 10
and 60 min of power-on.
• Once while making the
first copy after 60 min of
power-on.
Photo mode • Once while making the
first copy in photo mode
after power-on.
Table 4-102 Timing of Potential Control
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Measurement
8 (max.)
8 (max.)
1
Timing
) and
D