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COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
4-19 P
7.2 Controlling the Developing Bias
7.2.1 Outline
Both DC bias and AC bias are applied to the developing cylinder. The output is controlled
by the composite power supply PCB based on the control signal from the DC controller
PCB.
The following relate to the developing bias control system:
[1] Controlling the DC developing bias to a specific voltage level
[2] Controlling the AC developing bias to a specific voltage level
F04-702-01
Memo
The AC pulse ON signal is used as the primary charging output enable sig-
nal when controlling primary charging.
DC controller PCB
DC bias
ON signal
DC bias control signal
AC pulse
ON signal
AC bias
ON signal
J301
-B1
J136
-B12
-B4
-B9
J301
-A3
-A1
J136
-A10
-A12
J301
-B2
J136
-B11
Composite power supply PCB
PW-CPU
Transformer
drive signal
High-voltage
main
transformer
(for DC)
Developing
high-voltage
transformer
(for AC)
AC bias
Voltage level
Output
control
Voltage
detection
Developing
cylinder
J130-1
Transformer
drive signal
Serial
communication
DC bias level signal
Photosensitive
drum
J135
24 VDC input from
main power supply
+24V