Service manual

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.
Figure 2-2-1
CHAPTER 2
2 - 4
IC201
Laser control circuit
/VDO,VDO
Engine Controller PCB
Interface
controller
Video interface
control circuit
High-voltage
control circuit
Fixing control
circuit
Fixing unit
Low-voltage power
supply circuit
Scanner motor
control circuit
AC input
Reset IC
IC202
Sequence
control circuit
Motor,
solenoid
Sensors
BD PCB
Scanner
motor
Cartridge
Laser driver
High-voltage
power supply
circuit