If you set to <On>, image quality may be affected or a paper jam may occur when a certain length of time
elapses after printing on the front side or depending on the ambient humidity.
Printed Barcode Cannot Be Read
Are you trying to read a small barcode or one with thick lines?
Enlarge the barcode.
Changing the <Select Line Width> setting may solve the problem.
<Special Processing>(P. 226)