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Parts or the Whole Content is From:
Printer and Photocopier Troubleshooting and Repair Collection
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Samuel M. Goldwasser
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How Dot Matrix Printer Works
These are the only type of impact printers still in wide use. A set of steel pins - typically between 9 and 24 - strikes the paper through a fabric or carbon film ribbon. The pins are activated by solenoids which are controlled by the printer's control logic. Multiple passes may be used to increase the effective number of pins and improve print quality (letter versus draft mode).
Based on the popular HP P1000, the HP PhotoSmart 1215 photo printer directly accepts CompactFlash and SmartMedia
cards and prints wirelessly from infrared devices. No PC is required, but it is PC and Mac compatible.
With 2,400 x 1,200 dpi resolution and HP's enhanced layering technology, photos are stunningly beautiful and text
is razor sharp. The updated version is faster and quieter and has an optical sensor that automatically adjusts printer
settings for the paper type. Read more...
For text, an internal character generator (ROM) converts ASCII codes to pin firing patterns. For arbitrary graphics, the actual bit map is read out and used to control the pin drive.
The paper, carriage, and sometimes ribbon movement use stepper motors. These,
their drivers, or interconnect cables, are common problem areas.
Other Related Articles:
How Daisy Wheel Printer Works
How Inkjet Printer Works
How Laser Printer and Photocopier Works
Primer Basics
Some Inkjet History
Inkjet Types (from Xerox perspective)
Response Times of Resistance Heater Elements
How Many Colors Can One Get from Inkjet printer
Why are the inkjet primers RBY (red, blue, and yellow)