Advanced Tab; Print Quality - Brother MFC-8420 User Manual

Advanced tab

To return to the default settings, click the Default button.
Change the tab settings by selecting one of the following icons:

1 Print Quality

2 Duplex
3 Watermark
4 Page Setting
5 Device Options
Print Quality
Resolution
You can change the resolution as follows:
HQ 1200
600 dpi
300 dpi
When you select Use Duplex Unit, HQ1200 is not available.
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PRINTER DRIVER SETTINGS 12 - 5