Device functions Device functions are divided into five groups: ● engine control ● formatter ● image formation ● laser/scanner ● pickup and feed The following figure is a block diagram of the device: To external device (host computer, etc.) Figure 5-2 Device functional block diagram 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.
48 Chapter 5 Theory of Operation ENWW Output tray LASER/SCANNER UNIT FORMATTER Scanning mirror Laser BD ENGINE CONTROL SYSTEM diode sensor Engine power assembly ECU Scanner motor IMAGE- FORMATION cP hr aim rga inry g Develop- SYSTEM roller ing unit Priority input tray Cleaning Photo unit sensitive drum Pickup Fuser control Main input tray unit Transfer unit charging roller PAPER PICKUP/FEED SYSTEM FORMATTER ENGINE CONTROL SYSTEM Engine power assembly ECU LASER/SCANNER UNIT Scanning mirror Laser BD diode sensor Scanner motor