Digital BW, The Print

My 9500 refuses to accept transparent media without a backing sheet, or 
turning the sensors off. When the backing running out, the light stops 
shining back to the sensor and it thinks the paper is out. Same happens 
when the back side is printed dark (which happens when you are doing 
things like really rough proffs or ink purges, etc.). The reason for 
the banding is that the printer may do some sort of media feed check 
when it loads a sheet. If you watch it, it will pull the sheet past the 
head, then back it up a little to find the edge, then start printing. 
It's possible (though kind of unlikely) that they count the rotations 
of the paper feed motor to determin how fast the paper travels. Also 
doesn't the 2400 check the head height for every different paper? If it 
does than it would need to see the paper to do this adjustment.