HP LaserJet M1005 Service Manual - Page 64
Device functions, Engine control system (engine control unit and power-supply assembly), assembly
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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: Output tray LASER/SCANNER UNIT Scanning mirror To external device (host computer, etc.) FORMATTER Laser diode BD sensor Scanner motor ENGINE CONTROL SYSTEM Engine power assembly ECU Fuser unit IMAGEFORMATION SYSTEM Cleaning unit Primary charging roller Developing unit Photo sensitive drum Transfer charging roller Figure 5-2 Device functional block diagram Priority input tray Pickup control unit Main input tray PAPER PICKUP/FEED SYSTEM 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