Hi Sandy,
The XE-A106 has a rubber drum printer so it does not hit the paper hard enough to print on duplicate paper. This model is not designed to print double copies. You need a machine with a more fancy printer unfortunately.
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Anyone looking for a Sharp XE-A106 manual can find it here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp9.php
Mark
May 2010