3. OPERATION AND TIMING
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-90
The DC component of the grid and the developing biases is determined based on the Vg-Vd and Vg-V1
characteristics obtained through drum surface potential measurement and the target contrast potential
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.
Figure 3-510
The point identical to the target contrast
potential is detected, and the point is used to
obtain the target value of the grid and developing
biases; in the case of Figure 3-511, V1 and V2 are
target values.
Figure 3-511
The measurement data for the surface potential may be checked in service mode.
Table 3-501
Vd
Vdc
Specific value subtracted
VL
Contrast potential
Potential
(negative)
Vdc
V1
V2
VL
Grid bias
Potential
(negative)
Item
Description
Reference
V00-300V
Surface potential at 00 activation
280 to 380
V00-700V
Surface potential at 00 activation
480 to 620
VFF-300V
Surface potential at full activation
35 to 145
VFF-700V
Surface activation at full activation
40 to 190
Operation/inspection mode (FUNCTION)
Photosensitive drum potential measurement (EPC)
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