Functional block diagram of laser printer

Presented by :Kartik N. KalpandeFunctional block diagram of laser printer

Functional block diagram of laser printer contains 4 sections as follows1) System Interface2)Control System3)Image Formation System4)Paper pick-up/Delivery System

Functional block diagram of laser printer

System InterfaceThe use of system interface:Communication with host computer through I/O portsMonitor the users selection on printer control panel and display printer status information to the user.Store configuration information. manipulate the data or information into proper format.

Control SystemCoordinating all the activities of the printer required for the printing process.To drive the laser beam.Properly coordinate the image data from the interface assembly.It also controls and monitors the paper motion , the high voltage system, erase lamp and all motors.It also shares machine status information with the interface.

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Image Formation SystemTo form an image on the paper a laser requires electronics, mechanical, optical, electro photographical etc. many different technologies. inside a laser printer the image formation process revolved around an OPC drum (organic photo conductive).The complete image formation process consists of the six stepsClearing of the OPC drum.

Image Formation System (contd..)Conditioning of the OPC drum (the uniform charge of -600 v is applied to the complete surface of OPC drum).Electro statically writing the image onto the OPC drum (to write data a laser beam is focused on the selected areas of the drum).Developing the image on the OPC drum (To develop a latent image into a visible image).Transferring of the image from OPC drum to the paper.Fusing the image on the paper (This makes the permanent image).

Paper Pick-up/Delivery SystemThis System is responsible for :

Picking the paper from the input tray.Delivering the paper to the image formation system at the right time.Feeding it to the fusing station andDelivering it to the output tray.

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