Touch panel is malfunctioning.
If the screen does not respond correctly when you touch a key (the machine does not perform the operation or performs a different operation), follow the steps below to make the proper adjustments.
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Holding your finger on the screen, turn the main power switch to OFF and back to ON.
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Lightly touch the center of each +, in order from 1 to 5.
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Turn the main power to OFF, then turn it back to ON.