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OPERATIONS
AND
TIMING
I
3.
Developing Bias Operation
COPY
START
key
WMUPR
ON
\
V
SCRV
\
SCRV
\
WMUP
\
STBY
INTR
SCFW
\
SCFW
-STR
STBYt,
AER
Main motor
(M1
)
i.
Scanner
home
position
sensor
(Q3)
signal
AC
BIAS
ON
command
(ACBON)
DC
BIAS
CONTROL
..
*
*
*
* *
*
.
**
command
(DCBC)
W////
'/////////
«.'///
////M'/SSM
)
\
Figure 3-22
The
value
of
the
DC
BIAS
CONTROL
command
and
the
DC
bias are deter-
mined
by
(1)
the
setting
of
the
COPY
DENSITY
lever
and
COPY
DENSITY
knob,
(2)
the
AE
sensor
output,
and
(3)
the type
of
developing
assembly
installed.
The
DC
bias
used
at
times
other
than
during
scanning
depends
on
the type
of
developing
assembly
installed.
Black developing assembly: Approx.
-320V
CT
unit:
Approx.
-220V
Note;
The
AC
component
is
added
to
the
developing bias
for
a
CT
unit
when
the
main motor
is
operating.
3-24
COPYRIGHT©
199!
CANON
INC.
CANON
NP-15S0
REV.1 SEPT.
1992
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)
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