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First, check the batteries, and ensure there is not a paper jam in the printer. If both are fine, then while the calculator is in the "Print" mode, press the [CA] (or [AC]) button 20 times consecutively to clear out memory buffers. Try some numerical calculations, and if the problem persists, repeat pressing the [CA] button 20 times. If the problem still persists, then the calculator may require service
SETTING YOUR TAX RATE you hold your set % button down for three seconds until set shows again, then hit tax rate button it shows your tax rate, change your tax rate then hit set your tax rate should be set.
cliff notes: hold set% button hit tax+ button change the desired % hit set done Do rate the solution.
I have a Casio FR-1211 Printing Calculator and I have the same problem. I removed the roller and tried inking the roller with "Sanford's Roll-On Stamp Pad Inker". It works beautifully ! I don't know how long it will last, but for now the print is dark and clear.