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OPERATIONS AND TIMING
COPYRIGHT
©
1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Figure 3-306 shows the circuit that controls the
foregoing three types of biases, and the circuit has
the following functions:
• Turns ON/OFF the transfer roller bias.
• Controls the transfer bias to a constant volt-
age.
• Corrects the voltage level of the transfer bias.
Figure 3-306
DC
power
supply
24V
Transfer
bias control
circuit
Composite power supply PCB
Photosensitive
drum
Transfer roller
Transformer
circuit
24V
T5
TFWON*
TFWPWM
TFWS
TREVON*
Constant
voltage control
circuit
Current
limiter circuit
(transfer bias)
Constant
current circuit
(ATVC)
Current
limiter circuit
(cleaning)
Cleaning bias
control circuit
Microprocessor
DC controller PCB
Microprocessor (Q301)