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Service Manual
2.1.3.6 Bias Control
This section describes the bias control.
A diagram of drum charge bias, image transfer bias, detach bias and developing bias control circuit
is shown in Figure 2-31. These bias generate from the +24
These bias cut so that +24
detected.
These bias are controlled by engine controller board (MC
image transfer
active. And, while
signal is to LOW, the image transfer roller is charged to 1.2K
voltage supply circuit. And while this signal is to HIGH, the image transfer roller is charged to
The
control to drum charge and DETACH SAW bias. While this signal is LOW,
the DETACH SAW is charged to
The imaging cartridge has charged screen between charge wire for
charge screen is connected 310
surface to -310
The
signal control to developing bias. While this signal LOW, the developing roller is
charge.
The developing bias is changed by image density control volume. The developing bias is controlled
bias level (-205 V to -265
developing bias level.
Interlock
24
Low Voltage
Suppry Board
Rev.
is cut, while the interlock switch is off by case open
control. While
signal is to LOW, the image transfer roller is
and the
diode. The charge screen control potential of
by this volume. The image density is controlled so that the
Engine Controller
Board
24
Figure 2-31. Bias Control Circuit
Operating Principles
on high voltage supply board
The
and
drum is charged.
drum and
High Voltage Supply
Board
Image Transfer
Bias
1.2 or-O.6 K
Developing
:
Bias
-205 to -265
. . . . . . . . . . . . . . . . . . . . . . .
DETACH SAW Bias
-1
.
Drum Charge
r e c h a r g e
FG
signals are
by high
drum. The
drum
Screen
-310
2-19
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