Canon LBP6030w Manual page 157

Printed Barcode Cannot Be Read
Are you trying to read a small barcode or one with thick lines?
Enlarge the barcode.
In the printer driver, set [Special Print Mode] to [Special Settings 1].
[Finishing] tab
When you specify [Special Settings 1], printouts may be faded.
Downloaded from ManualsPrinter.com Manuals
[Advanced Settings] [Special Print Mode] [Special Settings 1]