Canon 1000 Service Manual page 135

c. Potential Correction
Under this control mechanism, correction is made to the grid and developing biases to compensate for
the changes occurring over time as follows.
Drum motor
Pre-exposure lamp
Potential measurement
Lasers for Y, M, C, Bk
Grid bias
Developing bias
d. Error Code E061 Associated with Drum Surface Potential Control
E061 is an error code associated with drum surface potential control.
The CLC1000 executes drum surface potential control during multiple initial rotation at power-on and
determines the grid and developing biases for each color with reference to the measurements taken and the
pre-determined contrast potential.
The detail codes of E061 are explained below according to procedure for drum surface potential control
and procedure for computation:
a.Procedure for Drum Surface Potential Control at Power-On
b Procedure for Computation and Associated Detail Codes
COPYRIGHT © 2001 CANON INC.
Start key ON
VD measured with reference to Vg
Difference between VD set by initial potential control
and VD measured newly to correct Vg and Vdc
Start key ON
STBY
CNTR
Drum full rotation
1/2 rotation
VD
Value determined
by potential control
Value determined by
potential control
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Figure 3-512
VD
00 activation
Value after correction
Value after correction
Figure 3-513
3. OPERATION AND TIMING
COPY
PWM activation
3-91