Not quite sure what your asking.... So when you send something from the rip, the printer moves the media forward. But the take up roller isn't working and it causing the media to back up and it causes a head strike?
The issue than is the media take up reel.
Is this a new printer? Has it been working than stopped? Can you give us more info, what you posted is kinda vague. Do you have pics?
Some quick things to check. Is the take up reel turned on? Is it set to wind in the correct direction? Is there a way to control it from the main computer that might have gotten switch off? Does it make any odd noise or do you get any error messages? Does the 800 series have the capabilities of printing on split rolls, is it set up the what your doing?