Engine Control System - Canon LBP-800 Service Manual

CHAPTER 2
II. ENGINE CONTROL SYSTEM
A. Engine Controller PCB
1. Outline
The operation sequence of the printer is controlled by the CPU on the engine controller PCB.
When the printer is turned ON and enters the STANDBY mode, the CPU outputs signals to drive
loads, such as the laser diode, motors, and solenoids, based on the pick-up command and image
data input from the interface controller.
A block diagram of this circuit is shown below.
/VDO,VDO
Interface
controller
Fixing control
Fixing unit
Low-voltage power
AC input
supply circuit
2 - 4
Engine Controller PCB
Video interface
control circuit
High-voltage
control circuit
circuit
Laser control circuit
Scanner motor
control circuit
Reset IC
IC202
control circuit
Figure 2-2-1
IC201
High-voltage
power supply
circuit
Sequence
Cartridge
Laser driver
BD PCB
Scanner
motor
Motor,
solenoid
Sensors