Star SM-L304 Series User Manual page 22

2. The de-curl switching lever is set to OFF by default, and you need to be set to ON if you would
like to use this function.
OFF
(default)
(Receipt paper/Label paper/Linerless Label paper)
3. Set the de-curl switching lever to OFF when label paper or lineress label paper is used.
Note: If the paper thickness of the receipt is out of specification, it may cause a paper feed
failure. In that case, please set the de-curl switching lever to OFF.
ON
(Receipt paper only)