Oki X400 - Manual (Page 20)

2. Confirm that the sensor type (Eye-mark or gap) in your software
setup matches yours print media.
Poor print quality
1. Confirm that the print media is properly loaded, and there is no
side-to-side motion of the paper as it feeds through the printer.
2. Check your software print darkness and print speed settings. These
settings may need adjustment for optimum results.
3. Try different print media. Old or inferior quality media will degrade
print quality.
4. If you are printing in the direct thermal mode, make sure you are
using direct thermal labels.
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