Question about Retail Supplies
You're using the USA manual to program a non USA version. Use the X button in place of @
Posted on Apr 23, 2015
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Posted on Jan 02, 2017
Most Sharp register, including the ER-A420, have a rechargeable battery mounted inside to hold all memory when the power goes out. It should last a few months, but two years is a bit much. This might get it going:
Posted on Dec 24, 2009
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