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The DC component of the grid and the developing biases is determined based on the Vg-Vd and Vg-
computed by PASCAL as follows:
The developing bias DC (Vdc) curve is
obtained from the Vd characteristic curve.
The potential between Vdc and VL in Figure 3-
510 is the contrast potential.
The point identical to the target contrast poten-
tial is detected, and the point is used to obtain the
target value of the grid and developing biases; in
the case of Figure 3-5111, Vi and V2 are target
values.
The measurement data for the surface potential may be checked in service mode.
Item
voo-3oov
voo-7oov
VFF-700V
Potential
Potential
(negative)
Description
Surface potential at 00 activation
Surface potential at 00 activation
Surface potential at full activation
Surface activation at full activation
Table 3-501
CANON CLClOOO REV.1 MAY 1997 PRINTEO IN JAPAN (IMPAIME
Figure 3-510
V I
bias
Figure 3-511
Reference
280 to 380
480 to 620
35 to 145
40 to 190
v 2
AU
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