HP 3380 Service Manual - Page 95
Printer functions and operation, Engine control unit (power system), - laserjet drum
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Printer functions and operation Printer functions are divided into four groups: ● engine control ● image formation ● laser/scanner ● pickup and feed The following is a block diagram of the printer and its relationship to the ADF/scanner and LIU. ADF Scanner system Face-down bin Motor controller Control Panel LIU Computer LASER/SCANNER Scanning mirror Formatter Face-up bin Laser diode BD sensor Scanner motor ENGINE CONTROL SYSTEM ECU Fuser Cleaning unit Primary charging roller Developing unit Photo- sensitive drum Transfer charging roller Pickup control Priority Input Tray Main Input Tray Figure 4-5. Note Printer unit functional block diagram PAPER PICKUP/FEED SYSTEM Engine control unit (power system) The engine control unit (ECU) coordinates all print engine activities, drives the laser, and coordinates print data from the formatter with the image-formation process. The ECU also includes the power supply and distribution circuitry. In several other HP LaserJet products, the ECU is also known as the controller PCA or the dc controller PCA. ENWW Printer functions and operation 79