HP 3015 Service Manual - Page 96
Printer functions (all models), Engine control system (engine control unit and power-supply assembly)
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Printer functions (all models) Printer 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 printer: Output tray LASER/SCANNER UNIT Scanning mirror To external device (host computer, etc.) FORMATTER Figure 4-3. Laser diode BD sensor Scanner motor ENGINE CONTROL SYSTEM Engine power assembly ECU Fuser unit IMAGEFORMATION SYSTEM Cleaning unit Primary charging roller Photo sensitive drum Developing unit Transfer charging roller Priority input tray Pickup control unit Main input tray PAPER PICKUP/FEED SYSTEM Printer 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 powersupply assembly PCA. 78 Chapter 4 Operational overview ENWW