The Printed Barcode Cannot be Scanned
Troubleshoot by checking in the following order:
Are You Using a Very Small Barcode or One With Thick Lines?
Enlarge the barcode.
If the barcode lines are perpendicular to the output feed direction, rotate the image 90° so that the lines are parallel.
Try using Barcode Adjustment Mode
Setting the mode in [Barcode Adjustment Mode] in the printer driver may solve the problem. The improvement effect is weakest with [Mode 1] and strongest with [Mode 5]. Try selecting [Mode 1] first, and then change to the next higher mode, as needed.
Specify the settings below in the [Printing preferences] screen of the printer driver.
[Finishing] tab  [Advanced Settings]  [Barcode Adjustment Mode]  select the mode |
* When this setting is enabled, the print density may decrease.
If setting [Barcode Adjustment Mode] to [Mode 5] does not work, changing the [Printer Density] may solve the problem.
[Printer Density]