Canon GP605 Service Manual page 176

CHAPTER 6 IMAGE FORMATION SYSTEM
Figure 6-202 shows the basic sequence (timing) of operations related to potential control.
A series of charging operations is executed to
stabilize the potential of the drum.
WMUP
Drum motor(M0)
Primary
charging bias
(DC)
Grid bias
Laser
Developing bias
AC bias (AC)
Developing bias
(DC)
Figure 6-202 Basic Sequence of Operations (potential control)
Main power
switch ON
Fixing assembly temperature at 195˚C
(end of fixing assembly warm-up)
[1] The control panel power switch is turned on.
[2] The front door is opened/closed.
Figure 6-203 Timing of Potential Control Operations
6-6
COPYRIGHT © 1999 CANON INC.
Potential control is as when the main power switch is turned on.
195˚C
Potential stabilization sequence
Optimum grid bias
determined
Fixed value
Potential control is executed 10 min and 60
min after the temperature of the fixing
assembly has reached 195˚C.
Potential
Potential control for
transparency
control
WMUPR
Potential control
Optimum laser output
determined
To prevent stray toner, the developing bias
is turned off for non-image areas.
The charging characteristics are likely to have
stabilized at this point, and potential control will
not be executed after this point.
10 min
Copy Start Potential
key ON control
Copy Start
key ON
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
200˚C
STBY
Transparency mode
potential control
Optimum laser output
determined
60 min
Potential
control