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Engine Control Unit (ECU)/power system
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Printer engine control system
Printer laser/scanner drive
Based on information received from the formatter, the ECU sends signals to the laser/
scanner assembly to modulate the laser diode “on” and “off” and to drive the laser/scanner
motor. For more information, see “Image formation system” later in this chapter.
Paper motion monitoring and control
The ECU controls paper motion by continuously monitoring the various paper sensors and
coordinating the timing with the other print processes.
For a detailed explanation of paper movement, and the interaction of photosensors and
solenoid with the paper movement process, see “Printer paper feed system.”
Motor
The motor is controlled by the ECU. The motor provides all of the printer's paper
movement.