Working With Printers Chapter 15 Release 22/10/2010powered by dj.

Working With Printers

Chapter 15

Release 22/10/2010 powered by dj

Slide 2 of 44Chapter 15

Objectives Differentiate between impact printers and non-impact

printers Identify the different parts of a printer Explain the working of dot matrix printers Explain the working of inkjet printers Explain the working of laser printers and all-in-one

printer Assemble a printer Connect a printer to a computer Troubleshoot printers



Printers Prints text documents and images on paper Different types of printer are:

Printers

Impact Printers Non-Impact Printers



Dot Matrix Printer (DMP) - I

Prints documents as well as graphics Uses a matrix of metal pins on print head to create

dotsPhysical contact is established between print head,

ribbon cartridge and paperDot matrix printer is a type of Impact PrinterUses electromagnet print head and tends to be

noisy Can not produce high quality document or graphics



Dot Matrix Printer (DMP) - II

Best useful in creation of multi-part document like invoices

No. of metal pins in printer head varies form 9 to 24

Speed varies from 30 to 550 cpsGenerally connected to LPT port Can achieve high resolutions by moving print

head slowly



Dot Matrix Printer



DMP Mechanism



DMP Subassemblies

Power Supply – supplies DC voltage to all other assemblies Logic Board – carriage motor control, PF motor control,

print head control and control panel Carriage Mechanism – carriage motor, timing belt, driving

pulley Paper Feed Mechanism – friction feed and sprocket feed Sensors – home position, paper, tractor or manual feed and

head gap lever DIP Switches – setting paper length, print direction and print

quality modes



Components of DMP - I

Head Mechanism• Head• Head Cable

Carriage Mechanism• Carriage unit• Carriage belt• Carriage motor• Belt driver pulley• Ribbon gear assembly• Carriage rod



Components of DMP - II

Paper feed mechanism• Paper feed motor• Paper feed gears• Platten rod Tractor mechanism Sensors – home position, paper, head gap,

tractor/friction Levers – head gap, friction/tractor



Question for GD Time Limit – 2 Mins

What is the difference between impact and non impact printer?



Thermal Printer

Uses heated pins to burn images onto heat sensitive paper.

Mainly used in calculators and fax machines; since they are inexpensive but they print slowly and produce relatively low resolution print jobs.



Types of Thermal Printer

Thermal Wax Transfer - Printer uses a wax-based ink to paper. A thermal print head melts wax ink from the transfer ribbon to the paper. When the wax is cooled it leaves the impression permanently on the paper.

Direct Thermal - A printer that uses to print image by burning dots to coated paper when the paper passes through the lines of heating elements.



Non-impact Printers

Known for quite operation as physical contact is not established between head, cartridge and paper

Different types of non-impact printers are:

Non-Impact Printers

Inkjet Printers Laser Printers



Inkjet Printers

Places extremely minute amount of electrically charged ink on paper to create images or text

Drops of ink are sprayed through a series of nozzles

Uses the piezoelectric crystal to introduce continuous ink jet method.




How does an inkjet printer work?



Structure of Printer - I Contains parts that accept, support and move

paper during the process of printing

PrinterParts

Feeder SupportEdge

GuidesCover

Output Try

Output Try

Extension



Structure of Printer - II


Feeder

Support

Edge Guides

Cover

Output Tray Output Tray Extension


Internal Parts of DeskJet Printer

Sensors – paper sensor, head home position sensor and cover sensor

Logic Board Cartridge Print Head Adjustable lever Control Panel – power, resume Service Station – caping, wiping and spitting



Practical Activity Time Limit – 8 Mins

Explain the internal parts of a deskjet printer.



Laser Printers

Uses a beam of laser for printing

Uses static electricity to combine ink powder and paper

Consists of a revolving drum/cylinder that is made up of photoconductive material

Drum is charged with the help of a charging wire called the charge corona wire

Laser Printer



Working of Laser Printer - I

First, drum is positively charged and laser beam from laser scanning unit creates a laser etched area on the drum with negatively charged.

Thereafter, a fine ink powder called toner is sprinkled on the paper which has to be positively charged.

As the drum rolls, the toner adheres to the laser-etched area of the drum

After this, the drum rolls over a paper.



Working of Laser Printer - II

The paper is given a negative charge. This negative charge must be stronger than the charge of the laser-etched electric image.

This will help the toner to leave the negative area on the drum for the negatively charged paper.

The paper is discharged as it moves out. The paper is passed through a fuser. As the

paper passes through the fuser, the toner melts due to the heat.

The toner is thus fixed on the paper.




Explain the working of a LaserJet printer.



Components of Laserjet - I

DC ControllerPower supply unitVideo control board Laser Scanning UnitPaper pickup assembly



Components of Laserjet - II

Separation padFuser UnitSensors – paper in/out and top cover sensorTonerInput and output trayTransfer Roller



All-in-one Printer

Now-a-days most people are going for all-in-one printer as it performs multiple functions like printing, faxing, scanning and copying.

Use USB port or wireless network to connect to the computer



Consumables

Consumables are the products which are used or consumed by individuals and companies

It must be replaced after a particular period of time.

Examples for some consumables are printer-related goods, which consists of ribbon, cartridges, toner, and paper.

Consumer should buy consumable products regularly.



Attributes of Printer

Speed – Defines speed at which a printer prints the documents. Measured in characters per second (cps) or pages per minute (ppm).

Dots Per Inch (DPI) – Specifies the number of pixel or dots of ink that the printer uses while printing a image or document.

Life of head and cartridge – Life of DMP printhead is 200 million dots/pin and life of ribbon cartridge is 3 million characters in draft mode of WeP LQ1050+DX DMP.




What are the attributes of a printer?



Practical

Perform the activity mentioned in Lab no. 1 in the text book:

• To assemble a Dot matrix printer.• Click on the image to run the video.



Practical


• To assemble the Inkjet/Deskjet printer.



Practical


• To assemble the LaserJet printer.• Click on the image to run the video.



Installing a Printer – Other Activities

Setting up a Printer – Paper Loading – Loading ribbon in DMP-Printer Self-test -



Practical


• To setup a DMP printer.



Practical


• To setup a DeskJet/Inkjet/All in One printer.



Practical


• To setup a LaserJet printer.



Practical


• To load paper in a LaserJet Printer and to load ribbon in DMP.



Troubleshooting

You may encounter different problems when working with the printer such as:• General Troubleshooting • Troubleshooting Dot Matrix Printers • Troubleshooting Inkjet Printers • Troubleshooting Laser Printers



Summary - I A printer is a peripheral output device that prints images and

text on paper Printers are classified into two main groups such as impact

printers and non-impact printers The main characteristics of a printer that a buyer generally

looks for are:• Speed• Dots Per Inch• Life of cartridge and print head

Dot matrix printers produce low-quality text and graphics at affordable prices

Consumables are defined as goods that are used or consumed by individuals and companies



Summary - II Thermal printer uses heated pins to burn images onto heat

sensitive paper Impact printers work by banging a print head against an ink-

soaked ribbon that is placed over paper that is being printed Carbon-copy printing is an application that requires dot matrix

printers Non-impact printers are noiseless as compared to impact

printers Inkjet printers and laser printers are the most widely used non-

impact printers An inkjet printer functions by placing minute drops of ink on

the paper that is being printed



Summary - III Laser printers function on the basis of static electricity A fine ink powder called toner is used for printing in laser

printers We can solve different problems of a printer by performing

troubleshooting. A printer displays flashing lights to indicate some internal

problem. A printer performs a self-test to segregate the problem

between printer and system. The printer DIP switches can set the configuration of a dot

matrix printer



Explorative Work

Refer to Internet, reference books or magazine to get the information.

Do not copy the information provided in this text book. Consult your faculty for further guidance.


Printer

Sl. Make Type Interface PPM Memory Size dpi Approx. Cost

1

2

3

4

5


Mind Map

Draw a mind map to summarize this chapter


Working With Printers Chapter 15 Release 22/10/2010powered by dj.

Documents

printer head

printers chapter

head control

print head slowlyrelease

thermal print head melts

paperdot matrix printer

paper length

print quality modesrelease