The ECU controls the following systems and functions:
● Printer engine control
● Paper motion monitoring and control (printing)
● Motor
● Printer laser/scanner unit
The engine power assembly provides the power system:
● AC power distribution
● DC power distribution
● Overcurrent/overvoltage protection
● High-voltage power distribution
Printer engine control system
Paper motion monitoring and control
The ECU controls paper motion in the printer by continuously monitoring the two paper
sensors and coordinating the timing with the other print processes.
For a detailed explanation of paper movement and the interaction of the sensors and pickup
solenoid with the paper movement process, see
Printer paper feed system.
Motor
The ECU controls the motor. The motor drives all of the printer paper movement.
Printer laser/scanner unit
The ECU sends signals to the laser/scanner assembly to modulate the laser diode's on and
off modes and to drive the laser/scanner motor.
40 Chapter 4 Operational overview ENWW
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