2. What is printer ?
Types of printer.
Dot matrix printer.
Working of dot matrix printer.
Advantages & disadvantages.
Working of inkjet printer.
Block diagram & working of laser printer.
Other types of printer.
3. A printer is an output device that produces text and
graphics on paper.
Many printers are primarily used as local peripherals. And
are attached by a printer cable or, in most newer
printers, a USB cable to a computer which serves as a
IN addition, a few modern printer can directly interface
to electronic media such as memory card, or to image
capture devices such as digital camera.
7. The term dot matrix is specifically used for impact
printer that use a matrix of small pins to create precise
Each dot is prodused by tiny metal rod, also called as
wire or pins. which is driven forward by the power of a
tiny electromganet or solenoid, either directly or through
Such printers would have either 7 or 9 or 18 or 24pins on
the print head.24 pins print head were able to print at
9. Interface logic:-This takes signals from PC i.e. data signal
and control signal.
Data buffer:-stores data from pc . then send to Rom for
getting dot information of perticular character then send
dot pattern to the print head.
Front panel & circuit:-used to select print mode &
Timing & control logic:-used to generate control signals
for printmechanism & interface logic.
10. Head coil drivers & head pins:-controls the
firing of different needles(pins) at appropriate
time corresponding to the matrix pattern of
the character to be printed.
Paper feed motor & paper feed motor drive:-
this is four-pase stepper motor ,moves the
platen by a fixed step. this moves paper
Sensors: 1)Head home sensor : it detects
wheather the head carriage is at the left
margin or not.2)paper out sensor : provides
signals when there is no paper in the printer
Versatile i.e.it produced graph, charts &pictures.
They cannot be used continuously for more than one hour.
Quality is not so good.
These printers are noisy.
Requires more servicing.
12. An inkjet printer is a type of computer thet reproduces a
digital image by propelling variably-sized droplets of
liquid material (ink) onto a page.
Desktop inkjet printers, as used in offices or at home,
tend to use aqueous inks based on a mixture of water
,glycol and dyes or pigments.
A typical ink-jet printer provides a resolution of 300
Dots per inch , although some newer models offer higher
14. An ink-filled print cartridge attached to the inkjet’s
The print head is made up of small ink-filled chambers ,
attached to a nozzle
Resistor heats a thin layer of ink at the bottom of the
chamber to more than 900 fahrenheit
15. As this vapor bubble expands , it pushes the ink
The ink droplet overcomes the surface tension of the ink
As the resistor cools,the bubble collapses
An electrical pulse flows through a heating element
Silent in operation.
High quality output.
Support color printing.
It requires periodic maintenance.
Not support multi-stationary.
17. Laser printer are non-impact printer which can print text
and images in high speed & high quality resolution,
ranging from 600 to 1200 dpi.
A laser eam project on image of the page to be printed
onto an elecrycally charged rotating drum coated with
Laser Printer produce very high-quality print and are
capable of printing an almost unlimited variety of fonts.
19. System interface
Image formation system
Paper pick-up/delivery system
1)System interface:-Manipulate or convert the incoming
data in proper format that the printer can use to create
the image on the photo conductive drum
20. Communicating with the DC controller assembly
Store font information
Coordinating all the activities of the printer
,required for the printing process
To drive the laser beam
Also shares machine status information with the
interface so that proper message is displayed on
3) Image formation system :- It consist of 6 steps
21. 1. Clearing
Picking the paper from input tray
Delivering the paper to the image formation system at the
Feeding it to fusing station
High quality printing
Support text and graphics
Quite in operation as no mechanical motion is involved.
The cost is more
Cost of toner is high
The expert person is required for maintdnance