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. C4224-90962 Engine Control Unit (ECU)/power system 45