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b)
When ACBON = 0
I, The AC bias switch circuit goes OFF.
The
output
of
the
square
wave
oscillator
goes to the Tl drive circuit. This
causes the AC high-voltage
transformer
to
generate
a 1300VAC
AC bias, which
is
supplied to'the developing
cylinder.
Also, the output
of the AC high-voltage
transformer
is rectified and supplied
to the
static charge eliminator (approx. 3.2 kV).
b.
Controlling
DC bias
The differential
amplifier of Figure 3-25
operates when DCBC is 16V or below. (The
range of DCBC (analog) is 6 to 16V, as set
by the
copy
density
cursor
or the AE
system.)
1. Drfferentral amplifier goes ON.
1 Vanable pulse-width
oscillator
goes ON.
LDC
high-voltage
transformer
goes ON.
The
DC
bias
is
applied
to
the
developing
cylinder.
The copy
density
knob
changes
the DC
component
of the developing
bias as shown
in Figure 3-24.
COPY
DENSITY
lever scale
-200
-300- \Y
\__j\
-400
-500
I
DC bias
-D
Figure 3-24 Changes
in Development
Bias (DC component)
by
COPY DENSITY Knob
Figure 3-25
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