Domain 4.0 Printers and Scanners

Domain 4.0 Printers and Scanners - A+ Study Guide: Domain...

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A+ Study Guide: Domain 4.0: Printers and Scanners - Printer Overview Introduction: In this section, you will probably learn more about printers than you ever wanted to. There are several different types of printers and you will need to know their print processes and common issues. First we'll take a look at the common connection types and then dive into the various different types of printers. Connections: Very old printers utilized a RS-232 connection that was either a 9 or 25 pin serial port and cable. The cable should be less than 50 feet long (15.25 meters). These connections required that the port be configured with parity type, speed, protocol and character frame. This connection type was eventually replaced with a higher speed parallel connection which have recently become obselete. Parallel connections utilize a DB-25 port on the computer to connect to the printer . The newest parallel ports were Extended Capability Ports (ECP) which offered increased performance over previous parallel standards. Both the computer's parallel port and the peripheral's port had to support ECP in order to take advantage of the higher speeds. Parallel cables are limited to less than 10 feet (3 meters) in length. Most current printers use USB, firewire, or ethernet (RJ-45) network connections. More expensive models are available that offer WI-Fi or Bluetooth connections. USB and Firewire connected printers can be shared over a network, however, the host computer that it is connected to must be left on in order for others to print to the printer. This is an advantage of the newer network printers which do not have this limitation. Dot Matrix: Dot Matrix printers for home use are nearly obselete having been replaced with faster, higher quality varieties, however, you may still come across them at some businesses . In fact, most cash registers use a dot matrix printer for printing out receipts. Dot Matrix printers use an impact printing process whereby a matrix of pins imprint an image on a ribbon. The ink from this ribbon is transplanted to the paper. Very old dot matrix printers used a pin feeding system that used paper with a series of holes along the sides of the paper (see image to the right). After printing the perforated edges with the holes are torn off. Newer models of dot matrix printers typically use a friction feed (rollers) mechanism. Troubleshooting: Smudges can be caused by the ribbon tension being too high. Broken printhead pins can cause incomplete or missing characters. If the tops of characters are missing, the printhead is misaligned with the platen and needs to be reseated or the printhead carriage may need to be adjusted. If the print gets lighter on the page from left to right, the printhead distance from the plate is uneven and will need to be adjusted.
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Thermal Wax: These are not a very common printer type, however, you will run across them in use for specialty applications. Thermal wax printers use a roll of cellophane like film that is made up of colored wax panels. These panels
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Domain 4.0 Printers and Scanners - A+ Study Guide: Domain...

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