Filter
Top Products
D. Controlling the Primary Charging Roller Bias
1. Outline
Figure 4-111 shows the circuit that controls the voltage applied to the primary
charging roller; the circuit has the following functions:
• turns on and off the primary charging roller bias.
• controls the primary charging roller bias to a constant voltage.
• switches the application voltage level for the primary charging roller bias.
• switches the application voltage level for the primary charging roller bias.
• corrects the scanning lamp on voltage level
The main transformer (T101) is driven by the drive signal (MPWM) generated by the
main transformer (T101).
The main transformer (T101), further, is used also as the high voltage transformer for
the DC power supply and others in addition to providing the above functions.
Figure 4-111
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
4-10
MPWM
PDCS
Composite power supply PCB
Main transformer
T101
Main transformer
(T101)
drive circuit
Rectifier circuit
Current
detection
circuit
Filter circuit
Voltage
detection
circuit
Micro-
processor
Q512
Q301 (Master)
Micro-
processor
PDC-PWM
PCS
Primary charging roller
Photosensitive drum
DC controller PCB