Engine Control System; Engine Controller Pcb - Canon LBP1760P Service Manual

CHAPTER 2
II. ENGINE CONTROL SYSTEM
A. Engine Controller PCB
1. Outline
The operation sequences of this printer are controlled by the CPU of this circuit. When the
power switch of the printer is turned ON and the printer enters the STANDBY mode, the CPU
outputs the signals to drive the loads such as laser diode, motors, and solenoids, based on the
print commands and the image data input from the external device.
Figure 2-2-1 shows the block diagram of this circuit.
/VDO
Video
controller
Fixing heater
safety circuit
Fixing heater
Fixing unit
control circuit
Low-voltage power
AC input
supply circuit
+24VA
Regulator
IC503
2 - 4

Engine Controller PCB

Video interface
control circuit
High-voltage
control circuit
Image control
+3.3V
Scanner motor
control circuit
Sequence
Reset IC
control circuit
IC502
+5V
Figure 2-2-1
IC501
High-voltage
Power supply
circuit
circuit
Cartridge
Laser driver
BD PCB
Scanner
motor
Motor,
clutch,
solenoids
Sensors
Options