Printer engine control system Paper motion monitoring and control The ECU controls paper motion in the printer 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 the photo sensors and solenoid with the paper movement process, see “Printer paper-feed system” on page 94. Motor The motor is controlled by the ECU. The motor provides all of the printer paper movement. Printer laser/scanner drive The ECU sends signals to the laser/scanner assembly to modulate the laser diode “on” and “off” and to drive the laser/scanner motor. Figure 15.
Overview of laser/scanner operation EN Printer functions and operation 87