Question about Canon P23-DHV Calculator
There is no control for contrast adjustment. But if the display quality has changed, it is possible that electromagnetic interference (EMI) or static discharge may have affected the display. You can try to reset the unit by pressing the reset button on the bottom with a ballpoint pen tip, but you will have to reenter the date, time, and tax rate if you do this.
Posted on Apr 29, 2008
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Posted on Jan 02, 2017
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