Media Feed Is Not Smooth

Is some other object coming into contact with the media?

Make sure that nothing touches the media. This may affect output, even when the feed appears to be smooth.

Is the media too thick?

Media that is too thick may not only cause unstable feed, but may scrape the print heads, resulting in malfunction. Never use such media.

Are the grit rollers dirty?

Check to make sure the grit rollers are free of buildup of foreign material such as media scraps.