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Printers
Unit objective: Identify printing processes, and install
and maintain printers
Topic A
Topic A: Imaging processes Topic B: Printer installation Topic C: Printer maintenance
An inkjet printer Ink dispersion Forces ink through nozzles Nozzles are 50 to 60 microns in
diameter Two methods:
– Thermal bubble– Piezoelectric bubble
Inkjet process
Thermal bubble technology Piezoelectric technology Ink cartridges
Inkjet cartridge print heads
Print head part of cartridge New ink cartridge = new print head Makes cartridge more expensive
Inkjet print quality
Standards– Laser printer for text– Darkroom photographs for graphics
Affected by:– Resolution (dpi) of printer– Quality of paper– Quality of ink if printed page gets wet
Calibration Dithering, also known as half-tones
Straight-through paper path
Curved paper path
Photo printers
Good print quality Quality not quite as good as that of
chemically produced prints Use special photo paper Some printers allow you to print
CD/DVD labels
Printing onto a CD
Laser printer
Standard of quality for other printer types High-quality, high-volume Black-and-white, and color Dropping in price
– Consumables can cost as much as printer
Laser printer components
Laser scanning assembly Toner cartridge Power supplies Paper control and transport assembly Transfer corona assembly Fusing assembly Electronic control package
Laser printing process
continued
Laser printing process, continued
1. Cleaning and erasing
2. Charging or conditioning
3. Writing or exposing
4. Developing
5. Transferring
6. Fusing
Note: Some sources place the cleaning and erasing stage at the beginning of the process. Others place it at the end of the process. In either case, it prepares the drum for receiving and printing the next image.
Dot-matrix printer
Can print multipart forms Slow and noisy compared to other
printer types Impact printer
– Use mechanical means to press ink onto a page
Near letter quality (NLQ)
Dot-matrix printer connections
Serial Parallel Rare network interface Some have both serial and parallel
Other impact printers
Daisy wheel Band printer
Other printer types
Thermal– Thermal wax transfer– Direct thermal
Solid-ink Dye sublimation Plotters
Topic B
Topic A: Imaging processes Topic B: Printer installation Topic C: Printer maintenance
Inkjet printer installation
Most local printers connect via USB Windows autodetects and installs
drivers Can install additional software from
manufacturer
Ink-level monitoring utility
Printer interfaces
USB Parallel SCSI Serial Wired or wireless Ethernet network
connections
Inkjet communications interfaces
Parallel interface USB interface
Configure the connection type
Parallel — Specify the correct LPT port– Usually LPT1
Serial — Specify the correct COM port– Usually COM2– COM1 used for modem
Port identified for the printer
Installing an inkjet printer
1. Connect the printer to a computer, using the correct interface
2. Plug the printer in
3. Power it up
4. Windows will probably recognize the new device and install drivers for it
5. If drivers aren’t installed automatically, do it manually with materials that shipped with the printer
Upgrading a device driver
Use Device Manager utility Follow prompts in wizard or use printer
installation file Configure options for best
performance
Laser printer setup
Unpack from packaging Remove all packaging materials and
tape Install toner cartridge
– Remove tape insert from toner– Rock from side to side
Might need to install drum or other components
Printer interfaces
USB Parallel Serial IEEE 1394/FireWire SCSI Wired or wireless Ethernet network
Communications interfaces
USB interface
Parallel interface
Installing a laser printer
1. Connect the printer to the network or a computer, using the correct interface
2. Plug the printer in
3. Power it up
4. Windows will probably recognize the new device and install drivers for it
5. If drivers aren’t installed automatically, do it manually with the materials that shipped with the printer
Installing a network printer in Windows 7
1. In Windows 7, open Devices and Printers
2. Click Add a printer
3. Click Add a network, wireless or Bluetooth printer
4. Select the desired printer and click Next, or click The printer that I want isn’t listed
5. If prompted, click Install driver
6. Enter a name for the printer and click Next
7. If desired, set as the default printer and print a test page
8. Click Finish
Topic C
Topic A: Imaging processes Topic B: Printer installation Topic C: Printer maintenance
Printer maintenance Follow manufacturer’s guidelines Common tools
– Cleaning solutions and sprays (isopropyl alcohol, denatured alcohol)
– Cleaning equipment (soft cloths, cotton swabs)– Lubricants– Compressed air– Toner vacuums and toner rags or extension
magnet brushes– Screwdrivers (to open compartments)– Chip puller
Safety Consumables
Inkjet printer maintenance
Change low ink cartridges Use recommended supplies Clean print nozzles and recalibrate printer Adjust ink output calibration for color
matching Proper ventilation Remove dust Test page Calibrate ink output for color matching if
available Set up with proper ventilation
Laser printer maintenance
Scheduled maintenance and unscheduled service calls
Routine maintenance– Replace toner cartridges– Clean and lubricate components– Replace components (parts-life counters)– Check and update firmware– Remove accumulated toner– Maintain adequate ventilation– Test page
Follow safety precautions handling toner and around high-voltage power supplies
Thermal printer maintenance
Clean heating element Remove debris Replace paper
Impact printer maintenance
Compressed air to blow out paper, dirt, and debris
Mild household cleaners on exterior Rubbing alcohol to clean roller Use ESD precautions and remove
neckties, watches, and jewelry; pull back and secure hair
Unit summary
Identified printing processes, and installed and maintained printers