Why can't the barcode or QR code on the printed label be scanned?

Reason ①: Low-resolution label file 

Choose PDF file formats instead of image formats, as printed PDFs are better quality than photos. If you must use photos, you should use high-resolution images.

Reason ②: Too high or too low print density

Please adjust the print density properly(between 8-14). 

If the printed barcode looks too light, it is recommended to increase the density by 1 at a time.

NOTE: Too high density may cause some unwanted dark lines, and the labels may get too hot and stick to the printer head.

Go to ‘Settings’-> ‘Devices’-> ‘Printers & Scanners’, find the printer ‘BY-482BT’, click ‘Manage’->‘Printing preferences’-> Click ‘Parameters’, and you can reset the new print density 

Reason ③:  The barcode or QR is horizontal when printing

Make sure to print the barcode vertically. If the barcode or QR you printed is horizontal, please rotate it to vertical before printing.

NOTE:  The high temperature causes black blocks on horizontal barcodes. 

Reason ④: Incorrect paper size settings

Please ensure the paper size of the printer settings matches the size of the loaded labels. The content should take up the whole label. If there are extra borders, the printer may “shrink” the size to a smaller size resulting in faded content. 

Reason ⑤: Dust or adhesive on the printer head 

Please clean the printer head with the alcohol swap by referring to the link: https://support.pedoolo.com/support/solutions/articles/151000077804-maintenance