HP LaserJet 3052 Service Manual - Page 95
Engine control system (engine control unit and power-supply assembly), Print-engine control system
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Engine control system (engine control unit and power-supply assembly) The engine control system coordinates all print engine activities. The engine control system includes both the engine control unit (ECU) printed circuit assembly (PCA) and the power-supply assembly PCA. NOTE In other HP LaserJet products, the ECU and power functions are combined onto one PCA known as the controller PCA or the DC controller PCA. In the HP LaserJet 3050/3052/3055 all-in-one, the control functions are primarily relegated to the ECU PCA and the power functions to the power-supply assembly PCA. The ECU controls the following systems and functions: ● Print-engine control ● Paper-motion monitoring and control (printing) ● Motor ● Printer (product base) laser/scanner The power-supply assembly provides the following functions to the power system: ● Ac power distribution ● Dc power distribution ● Overcurrent/overvoltage protection ● High-voltage power distribution Print-engine control system Paper motion monitoring and control. The ECU controls paper motion in the all-in-one by continuously monitoring the two paper sensors and coordinating the timing with the other print processes. Motor. The ECU controls the motor. The motor drives all of the all-in-one paper movement. ENWW Printer (product base) functions 75