Colour issues can be caused by various reasons. In this instance, black printing brown is caused by one of the following:
The black cartridge has expired: The first thing to check if the black is printing brown is the expiration date on the cartridge. The expiry date is located on the end of the cartridge as well as on the white label located on the side. If the cartridge has expired, we recommend it be replaced for a new one. You will then need to flush the new ink through the ink tubes and print head. To do this, you may print 10 black PRNs. You can access this through the SPM menu > Printer utilities and select the full bleed option.
If you have recently replaced your ink cartridge and are now experience blacks being brown, it could be that your previous ink cartridge was expired. If this is the case, then we would recommend you also print 10 black PRNs in order to flush the new ink through the lines.
Not printing through the Print Manager or incorrect settings: The issue could also be caused by not printing using the Sawgrass Print Manager or, if you are printing from a software other than CreativeStudio, incorrectly configured settings. If you are printing from either Photoshop, CorelDRAW or Illustrator, you may verify the correct settings by checking one of the colour settings articles.
Enable ColorSure palette: Depending on the paper and substrate you are using ,you may find that enabling the ColorSure palette under the Colour tab option in the Print manager settings can resolve this issue. When enabled, the ColorSure palette will lay down a bit more ink than normal in order to achieve a darker black.
If the colour issue occurs after pressing the image, it could be related to heat press settings. If substrates are pressed/baked for too long or at too high of a temperature, SubliJet black ink can turn brown/red. This is particularly troublesome with items such as tiles and mugs, which are pressed for a lengthy amount of time. The best course of action is to experiment with reducing the temperature and/or dwell time in small increments until black appears as it should.