Term
Printers
Dot Matrix
How many pins in a dot matrix print head?
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Definition
Dot matrix print head contains 9-24 pins. |
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Term
What is the interval on continuous perforated paper? |
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Definition
Perforations are at 11 inch or 14 inch |
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Term
What are the connections for Dot Matrix printers? |
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Definition
Serial and Parellel. USB, IEEE 1394, and Infrared was not yet introduced at the time these printers were made. |
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Term
What are the additional slots used for on Dot Matrix printers? |
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Definition
Additional ports are available for adding font cards, Memory, and additional paper feeders. |
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Term
What are other types of Dot Matrix printers |
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Definition
Daisy wheel and Band printers
Daisy Wheel printers can only produce fonts that are on the wheel.
Band Printers have the letters, numbers, and symbols repeated multiple times around on a band.
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Term
What are some of the Dot Matrix printing issues? |
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Definition
Print heads wear out.
Ribbon ink can clog the pins that make up print images.
Pins can bend
Electromagnet contained in the print head that regulates which pin to push forward can become damaged.
Ribbon issues-Poor print quality
Overheating-poor ventilation causes overheating.
Paper Jams-If paper is not straight the sides with perforation can rip off causing paper jams.
Printer drivers-Check drivers if there is no physical or connection problems.
Error Messages-Error messages are shown as blinking lights.
Memory-Most printers have no memory and rely on on the print jobs being stored. If the drive is filled this can result in lost jobs.
Configuration-There are no default settings but if font card or other additional features something on the printer or software to alert windows features are available.
Connection-verify cables are connected and the correct cables are being used. If printer has both serial and parellel make sure windows is accessing the correct port LPT or COM ports.
Print Quality-Check ribbon and replace if needed.
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Term
| What is preventative maintenance on Dot Matrix Printers |
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Definition
Use compressed air on printers internal components.
Use mild household cleaners on outside of printer.
Use rubbing alcohol on the rollers. |
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Term
Inkjet Printers
What is the nozzle size on Ink Jet printers?
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Definition
Each nozzle is 50 to 60 microns in diameter. |
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Term
What is Thermal Technology and Piezoelectic Technology
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Definition
Thermal Bubble heats the ink which vaporizes it, creating a bubble. The bubble petrudes out through the nozzel and sprays onto the paper.
Piezoelectric creates a bubble with Piezo Crystal behind each nozzle. A electric current behind each nozzle causes vibration. When it vibrates inward it releases ink. When it vibrates outward it pulls ink from cartridge. |
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Term
| What are the 2 different Ink cartridges. |
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Definition
Black cartridge-cartdridge with black ink.
Color cartdrige-Has compartments for Yellow,cyan,and magenta (CYM)
Note-some have cartridges for each color. Some also have more colors then the 3 (CYM) |
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Term
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Definition
| Shades of each color and varying the pattern of dots as well as density can make the color appear to be more saturated or darker. |
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Term
| Where are the print heads located and how many nozzles are there? |
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Definition
| Print heads are located on the cartridge. There are 300 to 600 seperate nozzles. |
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Term
| What is the DPI for Thermal and Piezoelectic printers |
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Definition
Thermal printers are 300 to 600 dpi but with software enhancements can be raised to 1200dpi
Piezoelectric printers print at 720 X 720dpi. Through software enhancements can print 1440x720. |
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Term
| Steps to Calibrating a Inkjet printer |
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Definition
Print a test page
Adjust printer setting to aligne print heads
Print another test page |
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Term
| Picture of straight through path printer |
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Definition
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Term
| Picture of curve path printer |
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Definition
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Term
| What are basic troubleshooting for inkjets |
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Definition
Use ASID troubleshooting method
Aquire information about the problem
ask the user what are the symptons
check printer for error codes
print test page if possible
review w2000or xp error codes in event viewer
simplify by removing any non-critical componants
Implement by identifying problable causes and implementing potential solution.
Document the error symptons |
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Term
| What are some of the problems with Inkjet printers |
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Definition
Cost of consumables-print cartdridges
Nothing prints
Poor print quality or stray lines
Paper jams |
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Term
| What are steps if nothing prints |
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Definition
Verify that print job is getting to print queue
Check power to printer
Check connection to printer
Check ink cartridges
Check printer configuration |
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Term
| What are steps for poor print quality or stray lines |
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Definition
make sure print heads are not clogged.
Check to see if printer is in draft mode either on printer or in windows
Stray lines means the print heads are worn, worn print guides, or the nozzles are clogged.
NOTE
Incorrect print drivers can also cause poor quality on print out. |
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Term
Laser Printers
What are the components of a laser printer
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Definition
toner cartridge
laser scanning assembly
Power supplies
Paper control and transport assembly
Transfer corona assembly
Fusing assembly
Electronic control package |
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Term
| What is the acronym ED and what is the ED process |
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Definition
ED-Electrophotographic Process
Combining electrostatic charges, toner and laser light a high quality image is produced. |
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Term
| What is the elements in toner |
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Definition
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Term
| Diagram of laser printing process |
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Definition
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Term
| What is laser printing process step by step |
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Definition
The Drum is positively charged by the Charge corona wire or charge roller.
the laser draws an electrostatic image onto the photosensitive drum
After the pattern is set the positive charge toner is applied to the drum
The paper passes through the transfer corona recieving a more power negative charge pulling the toned imaged from the drum.
NOTE
To keep the paper from sticking to the drum it is discharged by the detac corona wire.
the paper passes through heated rollers called the fuser where it melts the toner onto the paper giving final results once it hits hits the paper tray.
The drum with the image passes through the discharge lamp where the entire drum is charged causing the image to dissapear then the process starts over.
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Term
| What is the ideal humidity level for laser printer paper |
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Definition
between 25% and 50%
Below 25% causes static
Above 50% causes moisture |
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Term
| What are some of the problems with laser printers |
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Definition
Safety issues-Toner is toxic, Fusing rollers are very hot, Transfer coronas are high voltage due to the HVPS.
Paper Jams-Paper travels an s curve path so rollers can malfunction. Humidity levels can be high causing the paper to stick together or if the humidity is to low static is created causing paper to stick together.
If the printer seems to be fine but still not printing check communication.
Blank pages- Out of toner, HVPS is not working properly then the corona wires are not being charged. Broken corona wires.
Partial printing and smudges-Low toner, indistinct images results in faulty corona wire or roller or the HVPS. If images flake when it comes out then check the fuser assembly.
Repeating marks and stray marks-dirty rollers or scratched drum. In older lasers could be dirty corona wire. Stray marks are the result of dirt or loose toner or a damaged drum. Wavy output is the result of bad formatter board. ghost images is the result of fault cleaning blades or the erase lamp.
Garbage prints-Driver needs to be updated. The printer uses 2 languages
1.Postscript
2.pcl
upgrading the firmware with incompatible code will cause garbage printouts.
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