Xerox Phaser 3450 Service Manual

Also see for Phaser 3450: Reference guide Service manual Reviewer's guide Supplementary guide Service manual

Contents

Xerox Phaser 3450 Service Manual Manual pdf 137 page image

11-6CIRCUIT DESCRIPTIONService Manual11.2.2 Development Process11.2.2.1 Paper FeedPaper feed unit is operated by the engine and solenoid rotates the feed roller to feed one sheet of paper. The paper thenmoves on to the set and hits the actuator ofthe feed sensor. The engine at this time detects that signal and prepare to spread the the image data. If problems occursin the feed sensor, Paper Jam Error will appear in the OP panel. The feed sensor section is also closely related to the topmargin of the paper.11.2.2.2 Electric ChargeThis section charges uniform (-)voltage to OPC. When (-1380V) is charged to the Charge Roller, OPC drum is evenlycharged with approximately -800V. This is the first stage of the electric photo creation.11.2.2.3 Exposure UnitLSU exposes OPC drum by turning Laser Diode On/Off according to the digital data of the bitmap image data receivedfrom the controller board. The voltage difference created at this point is shown above. The exposed area to the laser is -150V, which relatively increases the electric potential and forms charge ripple. The areas that are not exposed to the laserdue to no video data will maintain -800V. As a result, image(black dot) is created in the -150V area and the -800V areawill show up white, which creates the basic condition of image formation.C/R-1380V-800VOPCUnexposured Exposured-800V-150V-800VUnexposuredOPC Surface