Question about Retail Supplies
If all power is on and the fuses all okey, maybe you will have to call a qualified tech
Posted on May 02, 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
Tips for a great answer:
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