I could't understand the question exactly..I will try my level best, it may helps you..
T770 plotter having three media paths..
1. Sheet path
2. Roll 1
3. Roll 2..
After initializing, printer will ask to load the media, you have to specify the desired media selection ie sheet, Roll1, Roll2..
If U R selected roll one, message appears on screen "Open Roll 1 cover", you have to follow the message, once the paper is loaded in the path, printer has to detect the paper,it has to pull inside with the help of the roll feed motor..
In this case If UR selected Roll 1 on printer screen & inserted Roll 2 media, printer will runs Roll 1 motor, not roll 2 motor.. This problem U might be facing..
If my suggestion is not helping U, pl let me know exact problem what UR facing...
on May 09, 2014