I have a Sharp XE-A102 till in my pub and it has started to turn itself on and off whilst in the middle of a transaction.
The amount I enter seems to appear on the receipt several times but it does not add to the total taken at the end of the night.

Wheatcrunchie, February 2011

If the whole machine blinks off then back on in the middle of a sale, it is usually a printer problem. See a dealer to get the printer checked. It happens quite a lot when used in greasy environments.

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If anyone needs more information, the Sharp XE-A102 manual is here:

http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A102_operating_and_programming_manual.html

Registerman, February 2011