The document describes the functional block diagram of a laser printer, which contains four main sections: 1) the system interface for communication and data formatting; 2) the control system for coordinating all printing processes; 3) the image formation system using an OPC drum to form images through a six-step process; and 4) the paper pick-up/delivery system for feeding paper through the printer.

1. Presented by :
Kartik N. Kalpande
Functional block diagram of laser
printer

2. Functional block diagram of laser
printer contains 4 sections as follows
 1) System Interface
 2)Control System
 3)Image Formation System
 4)Paper pick-up/Delivery System

3. Functional block diagram of laser printer

4. System Interface
The use of system interface:
 Communication with host computer through I/O
ports
 Monitor the user’s selection on printer control
panel and display printer status information to the
user.
 Store configuration information.
 manipulate the data or information into proper
format.

5. Control System
 Coordinating 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.

6. Image Formation System
 To 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 steps
1. Clearing of the OPC drum.

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

8. Paper Pick-up/Delivery System
 This 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 and
 Delivering it to the output tray.

9. Thank You..!!
Any Questions or
Queries