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This means the machine has no program. Try taking the batteries out, turn key to REG mode, turn power off for 5 minutes, then back on. Put batteries in.
Turn key to Program
1 SUBTOTAL
price (no decimal point)
Item button
SUBTOTAL
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The Se-S300 manual can be found here:
http://the-checkout-tech.com/manuals/cashregisters/Casio4.php
You have turned the key before finishing a task. turn the key back to the last position and the error should go away. Now finish what you started in that mode before turning the key.
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If anyone is looking for a Casio SE-S300 manual,
OPERATION AND PROGRAMMING MANUAL
http://the-checkout-tech.com/manuals/cashregisters/Casio_SE-S300_users_and_programming_manual.html
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