Brother QL820NWBC User Manual page 182

Troubleshooting
Problem
Printed barcodes cannot be read.
Solution
 Print labels so that barcodes are aligned with the print head as shown
below:
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1 Print head
2 Barcodes
3 Printing orientation
 Try using another scanner.
 We recommend printing the Barcode with Print Quality options set to [Give
priority to print quality] (except for 2-colour printing).
For Windows Vista
To display the [Quality] options, open the printer properties by clicking the
Start button - [Control Panel] - [Hardware and Sound] - [Printers],
right-clicking the printer you want to set up, and then clicking [Printing
Preferences].
For Windows 7
To display the [Quality] options, open the printer properties by clicking the
Start button - [Devices and Printers], right-clicking the printer you want to set
up, and then clicking [Printing Preferences].
For Windows 8 / Windows 8.1
To display the [Quality] options, open the printer properties by clicking
[Control Panel] in the [Apps] screen - [Hardware and Sound] - [Devices and
Printers], right-clicking the printer you want to set up, and then clicking
[Printing Preferences].
For Windows 10
To display the [Quality] options, open the printer properties by clicking the
Start button - [Settings] - [Devices] - [Printers & scanners] - [Devices and
Printers], right-clicking the printer you want to set up, and then clicking
[Printing Preferences].
For Mac
To change the Print Quality options, open the Print dialog box and choose
[Basic] from the print options pop-up menu.
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