Maintenance and repair of printers requires knowledge of the operating components in the system of the printer , and in this article offer Anatomy of a printer and an introduction to maintenance printer is one of the most important organs of the output as it has become an essential organ is necessary in order to complete office work such as printing reports , schedules and fees. This is different printers in terms of the type and method of work and cost as well, because the nature of the post desired printer is a key factor in the selection of printer below the other and we will bring in our study these differences and offer a simple solution to help us in the selection of the appropriate printer for our need.
First: – Printer Essentials :
We review the following most important traded terminology when talking about printers or even when buying a printer .
Measured speed of the printer number of pages can be printed per minute, based print speed precision used and also on the size of the page and whether the print color or monochrome , for example, in the inkjet printers are two -speed for printing and two -speed when printing in black and print speed when using colors speed drops when printing increased precision and color printing when using generally calculated with a print speed considering that 50 % of the area covered with ink when printing the full text .
Paper capacity :
Vary the amount of paper can be placed in the printer according to the type of printer , paper type, as well as there are several ways to feed paper used by different types of printers , for example, can put paper into a tray or drawer or several drawers and the printer to withdraw these securities , but in dot matrix printers can use a tractor and be perforated papers from both sides and there is no fixed length for a page printing, these printers are used to print invoices and see the abundance in phone booths , but for professional printers can use roll paper display up to one meter.
The cost of paper:
Some printers can use different types of securities , such as plain paper ( Gras Mag 80 ) or Glossy Paper Glossy print on transparencies (Transparent) , as well as mobile or paper , your pictures ( very fine polished with a gloss ) .
Duty cycle :
Reflect the number of pages the printer can print within one month, as the amount of ink covering 5 % of the area of the page .
Second: – The types of printers :
Will be exposed following are the main types of printers , namely:
Dot matrix printers : Dot – Matrix Printers
The dot matrix printers one of types of printers strike , any printers that are carried out by the print head to strike the paper to dig them shape or character desirable , although these printers, high noise and slow to work with a print resolution of low , but it is still used so far for fundamental reasons is that the printer raster is the only printer capable of producing more than one copy at the same time such as printing invoices , for example , and the very low cost of printing any ink that the tape is never inexpensive .
Raster printer uses to print head consists of a matrix of pins be number 9 or 18 or 24. Increasing the print resolution increasing number of pins in the printhead , ink ribbon passes in front of the print head so that it is between the head and the paper, and while printing the print head hits the ink ribbon off the paper so desired shape character .
The printer raster print each page as a set of points as they are considered page sent to the printer as an image composed of dots and the printer starts printing from the top to the bottom line by line and each line consists of a set of columns any points , so it does not print letters in its entirety directly , but each character is printed in several phases from top to bottom .
The printer raster monochrome often , but there are some species capable of producing a color image , dot matrix printers colorful need to strip ink multiple colors and does not require extra effort from the user to achieve this process as sufficient replacement tape monochrome ribbon color will the printer produce color pictures and so on the grounds that the printer is essentially color and printer driver and composite exists within the operating system.
Printers Line Printer :
Printers use Line Printer same method of dot matrix printers to print perfectly with minor difference is that the size of the printer head is equal Viewing and thus the print head is fixed and able to print a line full at the moment the one used when the amount of work is so huge such as printing telephone bills, electricity and water bills .
Ink – Jet Printers:
The inkjet printers – inkjet printers is simple compared with dot matrix printers because it is the less weight and less complex than the mechanical side .
Began inkjet printer to control the largest share of sales and proliferation due to being easy to install and maintain the ability to produce images of color high-resolution , as it is less noisy printers strike and more speed in printing, but the basic problem with these printers lies in the cost of printing as the print one page color may cost 20 times the cost of printing page colored laser printer , but the cost of the printer itself is not as high as it is able to produce images at up to 1444 * 720 dpi, different printing speed in these printers by printing precision whether printing colored or non- colored.
Be in most of the ink tank printers integrated with the printhead as in shape and are thus maintaining the print quality as a result of replacement of the print head with ink tank frequently, have the print head very fine holes which ink is pumped toward the paper .
The form of ink tray
To do inject ink toward the paper , there are three basic techniques currently in use are:
Line up the holes in the vertical print on paper with the holes on the cut Crystal expand when the passage of electric current . Stretch crystal ink are forced to get out of the hole toward the paper.
In this technique the ink is heated inside the hole to allow the formation temperature bubble expands to get out of the exit hole with the amount of ink to spray them on paper .
In this technique ink continues to flow inside the print head and through the variable cargo compartment , where points are shipped ink that will come out of the paper , and the spots will be charged back to the ink tank to be used again.
The laser printers , the best printers ever for their ability to produce monochrome images or high-quality color and relatively low cost .
Featuring laser printers print quickly as it can reach a speed of desktop printers to 20 pages per minute , and the duty cycle which is very high up to tens of thousands of pages per month. Other than that they are very quiet during printing and not noisy . The only negative for these printers is the high cost compared with other types of printers but contrast is characterized by a decrease the cost of printing each page as is evident from this printer is a ray laser used in the printing process .
Printers use different kinds techniques promise to translate the page to be printed to a printer language or the so-called printing orders .
These commands will cause , for example , to move to a new line as follows months types of printers languages :
American Standard Code for Information Interchange:
The code ASCII more code standard and there is hardly a system is unable to deal with this code in addition to the values of the equivalent of the letters , numbers and symbols on a standard keyboard , the code ASCII also includes a variety of command codes control the transfer of data which can be used by some to control the printer from these commands code 10 or 0Ah mean a new line (Line Feed).
Printer Control Language (PCL)
Developed a HP PCL language to the supports a very broad range of printing commands designed this language print text at the beginning and does not support advanced graphics .
PCL 6 is the latest versions of the language and supports this version control the size of the text in addition to some of the features of drawing lines and shape in this language depends on the printer itself in the printing process it must be supported by the printer control circuit this language so that they can be used in print.
Company has developed Adope these as page description language PDL in the early eighties . This language supports high resolution graphics and fonts to adjust the size . Be Interpretation language exist within the PostScript printer (PostScript interpreter) so this language can be understood by the printer at the entity level steel (Hardware). Thus, image processing is mainly performed within the printer and not by the system processor to print these printers faster .
Printing in the Windows system :
WINDOWS systems use a set of software components claims GDI graphics device interface . This software allows the management of the printing process . System uses GDI processor computer to carry out the printing and it calculates the values of color for each point on the page and then sends system GDI this information to the printer to implement the print job directly example, when printing text font type (True Type) is to convert this text to (bitmapped Image) is GDI system calculates the color values of the points and then sent to the printer .
It should be noted to the GDI system is responsible for all operations within the graphical Windows system and not only the printing process and the printer can support more than one print language .
If the computer has an outlet for infrared be possible to connect the printer to a suitable device with infrared wireless communication becomes then between the computer and the printer is possible. Of course, this connection is very slow compared to the rest of the communication patterns
VI : How to choose the appropriate printer :
Given the multiple types of printers is very large price difference and convergence specifications and features , the process of buying a printer suitable solution becomes a difficult problem .
To reduce confusion must first think about the material cost for each of the printer and inks for the replacement of the later and most of all actual and specific printer selection process is the desired task .
Still dot matrix printers used to lower the cost of printing and for being only able to print models of several layers such as invoices .
Despite the high cost is the inkjet printer perfect solution for color printing operations , domestic and office .
The high cost of laser printer fits perfectly high print quality and high productivity enjoyed by .
Printers have their own languages called for page description languages PDL. Modern printers working on a Windows system , which uses a technique Graphics Device Interface GDI to accomplish printing tasks .
Printers reached Parallel port LPT1 traditional but modern printers can be connected to the Universal Serial Bus USB talk .
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