Scanner

• A scanner is a device that converts data on a page to a format that can be shorted on the computer.
• The different types of scanners used for industrial or home use have a varied range of costs and capabilities.
• The different types of scanners are : 1. Flatbed Scanners 2. Sheet fed scanners 3. Slide Scanners 4. Drum Scanners.
• The front of a scanner consists of a power indicator light and a power on/off button.
• The back of a scanner has ports for connecting the scanner to the power outlet and the computer.
• The cover of the scanner protects the interior from dust and other particles.
• The image or document to be scanned illuminates the image or document to be scanned.
• The scan head captures the light that bounces back from the document.
• Scanners have two or there mirrors in the interior.
• A Charge-Couple Device (CCD) array converts the light reflected from the documents to a stream of electric voltage.
• An Analog to Digital Converter (ADC) converts the electric stream to a series of pixels of data that is then transferred to the computer through the appropriate port.
• A scanner can be connected to a computer through the parallel, USB or SCSI port.
• Parallel port scanners tend to be the slowest while SCSI scanners are considered to be the fastest.
• You must disconnect any other parallel port devices connected to the computer, before installing a parallel scanner.
• You can use a USB scanner and a printer simultaneously.
• Computers that do not have a SCSI port need a SCSI adapter card to connect to a SCSI scanner.
• Configuration of the scanner enables you to produce better scanning results.
• Calibration of a scanner removes the necessity of repetitive editing of images on a scanner.
• It is necessary to follow troubleshooting steps in s systematic manner in order to solve problem with your scanner.