HP 3380 Service Manual - Page 100
Paper-motion monitoring and control, Motors, Printer laser/scanner drive,
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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 photosensors and solenoid with the paper-motion process, see Printer paper-feed system. Motors The ECU controls the motors. The main motor provides all of the paper movement in the printer. The fan motor rotates the fan to cool the printer. Printer laser/scanner drive The laser/scanner system is controlled by the ECU, which sends laser control signals CNT0, CNT1, and CNT2, and by the formatter, which sends video signals /VDO1, VDO1, /VDO2, and VDO2. Figure 4-8. Overview of laser/scanner operation 84 Chapter 4 Operational overview ENWW