Canon iR4570 Series Service Manual page 220

Chapter 6
iR3570/iR3570F/iR4570/iR4570F
[1]DC controller PCB
[2]Laser driver PCB
[3]Scanner motor PCB
[4]BD PCB
6-4
[1]
Single
VDO1
CNT0
CNT1
CNT2
VDO2
PWCHG
FG PULSE DETECT
POLYGON FG
VDO1
GND
/VDO1
CNT0
CNT1
CNT2
/VDO2
GND
VDO2
GND
+5V
PWCHG
STAND BY
FG PULSE DETECT
POLYGON FG
+24V
P ACC
P DEC
GND
+3.3V
BD
GND
F-6-3
T-6-6
Description
Image data single input
Laser driver control signal
Laser driver control signal
Laser driver control signal
Image data signal input
Light intensify switchover signal
FG PULSE detecting signal
FG output signal
[2]
[3]
[4]