Credit Card Swipers are Plug and Play devices. They should show a green light when not being used. If they show a yellow or red light, the device more than likely needs to be replaced.
If the light is green on the swiper and swiping a card in Visual Matrix doesn't work, open up notepad and have them swipe the card. If it shows data, it's working, and the computer probably needs a reboot.
Cleaning the Swipers with Alcohol Soaked key cards is the best way to clean them.
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