This document provides an overview of different types of printers including impact and non-impact printers. It discusses the basic components and working of laser printers in particular. Impact printers like dot matrix printers work by physically striking characters onto the paper using an ink ribbon. Non-impact printers like inkjet and laser printers form characters without touching the paper. Laser printers use a photoconductive drum, laser beam, toner powder, and fusing process to produce high-quality printouts at high speeds but are more expensive than inkjet printers. The document also notes some common issues that can occur in printer components like the imaging drum, fuser, and pickup rollers.

1. 1
 PHASE I INTRODUCTION
 PHASE II PRINTER &TYPES
 PHASE III NON IMPACT PRINTER
 PHASE IV IMPACT PRINTER
 PHASE V DIFFERENCE BETWEEN
IMPACT PRINTER & NON
IMPACT PRINTER

2. 2
INTRODUCTION
 Printer was firstly invented by
Christopher Shole in 1869 and in 1873
firstly the work of printing was started by
Remington and from that time different
techniques are developed for the
invention of printer. In 1953 first high
speed printer was developed by
Remington.

3. There is a very good change
that it is an Ink jet printer. Since
introduction in the later half of the
1980 years. Ink jet printer have
grown in popularity and an
inexpensive colour printer made by
hewlett packard.
Continue…

4. 4
Printers are the most commonly
used and popular output devices. They
provide information in a permanent
readable form. They produce printed
output of data. Prints text or image on
paper called hard copy. The printing
speed of a printer is measured in pages
per minute (ppm).Printer resolution is
often measured in dots per inch (dpi).

5. 5

6. Types of Printers
6
Printers
IMPACT PRINTERS
Ex: DMP, LMP
NON IMPACT PRINTERS
Ex: Ink jet, Laser Jet

7. IMPACT Vs NON IMPACT
• Character is formed by
striking against an inked
ribbon
• L ow Speed
• Print quality comparatively
low.
• Multiple copies up to 06
numbers
• Noisy
• Character is formed without
any direct striking on paper
• High Speed
• Print quality high for all
• No multiple copies
• Quite
7

8. 8
PHASE-III
IMPACT PRINTER
 Impact printer head strike on
the ink ribbon by physical contacting
the paper. We can say impact printer
operate in similar manner to
typewriter . Impact printer work’s on
electro mechanical magnesium .
Impact printers are the oldest
printing technologies still in use.

9. IMPACT PRINTERS
A. DOT MATRIX PRINTER
B. CHARACTER PRINTER
C. LINE PRINTER

10. 10
DOT MARTIX PRINTER-:
In dot matrix printer character are
form using a number of dot to dots hit
the ribbon against the paper and
character is formed . It contain 9,24
pins in their printer head . It is good
quality printers. Speed of a dot matrix
printer is 150 to 300 characters per
second.

11. 11

12. DMP
Classification of Dot Matrix Printers
12
DMP
80 Column
9 pin and 24 pin
L x 800
L x 240
136 column
9 pin and 24 pin
EX 1050+
LQ 1050+DX

13. 13

14. 14

15. 15

16. 16

17. 17

18. 18

19. 19

20. 20

21. 21

22. 22

23. 23

24. 24

25. 25
 Non impact printers are the printers
that produce their output without making
contact on the paper to be printed . They
use several technique such as electro
sensitive, electrostatic inkjet and laser
technique for printing. Non impact printer
are the faster form of printer they are also
much less noisy than impact printer.

26. The most common form of Non Impact
printer are :-
1.INK JET PRINTER.
1.LASER PRINTER.

27. 27
 An inkjet printer is non impact
printer in which the printer does not
have any contact with the paper to be
printed . An inkjet printer uses most
popular printing technologies (such as
thermal heating bubbles inkjet
technology)

28. An inkjet printer consist of fine nozzle in
which a jet of special ink is ejected on the
paper . The characters are formed by
controlling this nozzle electrically . The
nozzle moves horizontally to print the next
character . The advantage of inkjet printer
good quality printing with very high quality
resolution. The collectively low cost and
multipurpose printing abilities make inkjet
printers a good choice for small distance
and home offices.
Continue…

29. INKJET PRINTER
29

30. HISTORY OF LASER JET PRINTER
The first commercial implementation of
a laser printer was the IBM model 3800 in
1975, used for high-volume printing of
documents such as invoices and mailing
labels. It is often cited as "taking up a whole
room," implying that it was a primitive
version of the later familiar device used with
a personal computer.
Presently the laser jet printer used are LJ
1050.1020

31. 31

32. 32
A printer using laser beam used a photo
sensitive drum to provide on image of the
text. The bits of the data sent by the
computer to the printer acts two term laser
beam On or Off .

33. A negative electric charge is applied to
surface of the drum where laser beam ON
or OFF the electric charge of the beam
become positive when laser beam are
exposed. The laser exposed parts of the
drums surface attracted negative charged
toner (Ink powder) which are transferred to
the paper.

34. Then the paper moves to a pushing
station where toner on permanently fused
on the paper with heat and pressure . The
print quality of laser printer is excellent .
There are quite in operation and uses
standard photo paper . High speed leaser
printer print at speed over 200 pages per
min. . A low speed printer can print 6-25
pages per min.

35. Fundamentals of LASER Printer:-
LASER stands for Light Amplification by
Stimulated Emission of Radiation
Classification of Laser Printer
1. Mono Laser
2. Color Laser

36. 36

37. IMPACT Vs NON IMPACT
• Character is formed by
striking against an inked
ribbon
• L ow Speed
• Print quality comparatively
low.
• Multiple copies up to 06
numbers
• Noisy
• Character is formed without
any direct striking on paper
• High Speed
• Print quality high for all
• No multiple copies
• Quite
37

38. Sr.
No. INKJET PRINTER LASER PRINTER
1 It is cheap in price. It is expensive than Inkjet Printers.
2
They have nozzle from which
ink is sprayed onto paper and it
gets printed.
Instead of nozzle they used imaging
drum
3
Ink in the cartridges is in liquid
form, which dries if not used for
a long time.
Ink is in the form of toner (powder),
it does not dries up even if you don’t
use it for a long time.
4
Ink should be refilled in a short
span of time, which makes it
quite expensive.
Ink in these printers lasts long. So,
there is no need to refill the bar again
and again.
5
At last, buying these printers in
not expensive but using it over
time costs more and more.
Buying these laser printers, is
expensive at first but using it over
time it costs less than Inkjet Printers.
6 Printing process is slow. Printing process is fast.

39. BASIC COMPONENTS OF LASER
PRINTER
1. PHOTO RECEIPTER DRUM
2. LASER SCANNING UNIT
3. TONER HOPPER
4. DISCHARGE LAMP
5. DEVELOPER ROLLER
6. FUSER
7. CONTROL CCT BOARD

40. 40

41. 41

42. When a printer command received from
source, the control cct board convert the
digital data into electrical signal and applied
to laser scanning unit . The unit having
laser diode which emits the light (laser
beam) according to data and strike into the
image drum negative charge. Further
corona wire touch with developer that
transfer the charge with reversed line.
Positive electrostatic image on a negative
background.
WORKING OF LASERJET PRINTER

43. 43

44. THE IMAGE DRUM HAVING A THREE PARTS
1. Corona wire
2. Discharge lamp
3. Developer
Physically photo receipted drum having corona
wire with total positive charger. If laser beam
strikes the corona wires that are converts into
positive charge. Then further developer touches
with toner . The toner is a fine black powder ,
which has a positive charged and toner clings to
the negative charged areas of the drum The
powder pattern affix the drum roller over a sheet
of paper which moving along with drum it can pull
the toner powder away and moving into the fuser.

45. LASER ASSEMBLY

46. 46

47. The fuser is a pair of heated roller, the paper
passes though these roller and looser
powder melts and fixes permanently. The
fuser roller further push the paper to the
output tray .
After depositing toner on the paper, the
drum surface passes to the discharge lamp.
The entire photoreceptor surface crazing the
electrical image and the drum surface . Then
passes the charge corona wire which replies
the positive charge for further nest charge
action.

48. THE LASER WRITES ON A
PHOTOCONDUCTIVE REVOLVING DRUM
IMAGE DRUM

49. THE DRUM ASSEMBLY COMBINED IN ONE
REPLACEABLE CARTRIDGE.

50. 50

51. 51

52. 52

53. 53

54. Some Main Parts of Laser Printer.
Imaging drum Fuser Assembly
Formatter Board Power supply
Board

55. Paper pick up roller
Cluch Gear Fuser Drive Gear

56. Main motor Paper Input tray
Transfer Belt Transfer roller

57. •Fuser Assembly parts.
• Pressure roller
•Teflon
•
• Bushing

58. • Fixing film Assembly. Heating element.

59. • Imaging Drum:
• The imaging drum is the heart of the laser printer or the copier. It
transfers the print image, consisting of toner, onto the paper.
• What happen when imaging drum get fault ?
• Printer Stops Printing.
• Faded or Blurry Prints.
• Lines on Prints.
• Spots and Blotches on Printouts.

60. •What happen if fuser assembly is bad?
•Ghosting.
•Double image.
•Streaking.

61. Black lines & smudges.
• Jamming
Remedies: Cleaning of bushing, change Teflon
Clean rollers. Cleaning of heating element. At major problem we have
to change the complete fuser assembly.

62. • Transfer belt
• What happen when transfer belt doesn’t work?
• Vertical lines on print page.
• Dot on print page.

63. • Transfer roller.
• Defects of transfer roller.
• Printer will make noise while printing.
• Frequent paper jam.
• Unpleasant smell when the printer is running
• Light printing.
• Streaks or spots.

64. • Pick up rollers.
• Results when pick up rollers got
defective.
Paper jam
Paper not pulling
Paper pulling more than one.
Remedies
Cleaning of pick up roller.
Changing of pick up roller.

65. • Separate pads.
• Its main function is to fixed
the size of paper to be printed.
Eg. A4 size, Legal paper etc.
Duplexing Assembly.
Duplexing assemblies are needed for two-sided printing. They are
typically mounted on the back of a laser or inkjet paper. After one side is
printed, the paper is routed to the duplexing assembly, which turns the
paper over and reroutes it through the printer a second time

66. • What will happen if duplexing assembly got defective?
• Problem while both side print.
• Paper jam while both side print.
Remedies:
Cleaning of duplex assembly.
Replacing of duplex assembly.

67. CONCLUSION
Advantages of a Laser Printer
The main advantages of laser printers are speed,
precision and economy.
•A laser can move very quickly, so it can "write"
with much greater speed than an ink jet. And
because of the laser beam has an unvarying
diameter, it can draw more precisely, without spilling
any excess ink.
• Laser printers tend to be more expensive than
inkjet printers, but it doesn't cost as much to keep
them running - toner powder is cheap and lasts a
long time,

68. DISADVANTAGES
1. Laser printers are more costly.
2. The cost of the cartridges is more.
3. In a hot or humid climate a laser printer may
not work properly.
4. Laser printers only really print on certain
kinds of paper.
5. Many of Laser printers are limited by the
amount of memory. This can sometimes limit
the number of fonts that you can use. To
expand the memory of your colours laser
printer you usually have to buy a small RAM
board

70. 70

71. 71

72. 72

73. 73

74. 74

75. 75

76. 76

77. 77

78. 78