E. Controlling the Development
Bias
1.
Figure 3-28 shows the circuit
the
development bias and has the following functions:
Tums the development bias
component
and OFF.
the development bias DC component
The
varies the
of the
mentbiastocontrolthecopydensityaccordingtothe
settings of the following:
Copy
key position
sensor output
Developing assembly type
When
black developing assembly set.
and -4 are shorted by
of a jumper wire,
thereby identifying
of the assembly.
2. Mechanism
a. Tuming the Development Bias
and OFF
The square wave
at
at
times as long as power present.
When
bias switch circuit goes
wave oscillator circuit output
The
condition
the developing
cylinder of
biases.
When
bias switch circuit goes OFF.
The
condition causes the
bias switch
circuit to go OFF; as
the output of
square wave oscillator sent to the Tl drive
circuit. raised 1300
and supplied the
developing cylinder. The output of the
the other hand,
fied by the rectifier circuit and supplied to the
static eliminator (about 3.2 KV).
1992 CANON
C A N O N
I N J A R N I M P R I M E
Summary of Contents for NP-2120
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