Hi Jane: I'll always say that the canned air that you buy for computers is the best thing there is. And, I'll always maintain that exercising the Braille display now and then is a great option. Some people on this list say that it voids any guarantees, I've never heard that, nor have I seen it in the manual. The manual does say to clean the display with a damp cloth. I mean, barely damp. This is how the manual quotes it.
Each cell of the Braille display has eight pins. For each pin there is a special crystal that lifts the pin to make a dot, and allows the pin to drop when there is no dot. The pins have to be able to move freely. In normal use dirt unavoidably accumulates on the display and around the touch cursor buttons. To prevent the pins from jamming, the display and touch cursor should be cleaned regularly. Cleaning the Braille display is not straightforward. We recommend that you send the BrailleNote BT back to an authorized BrailleNote BT service center every twelve months to clean the Braille display. Making sure that your hands are always clean is a good start towards minimizing problems with your Braille display. We suggest that once per week you wipe the surface of the Braille display using a soft damp cloth. The cloth should be squeezed hard to ensure that all excess moisture has been removed. Use only warm water on the cloth.
