AIO 962 'carriage stall' and belt issues (HELP -- pic inside)

There is a silver metal bar that the carrier rides back and forth across, you can see it in your pic.  Follow that bar all the way to the left and right, you will see the round notches that the belt should be replaced on.  They will be a few millimeters above and behind the end of that bar on both sides, the one on the left is black, and the one on the right is white (with a silver spring next to it).  You're probably going to need a flashlight.  The ribbed portion of the belt should be facing in when replaced.  This might not be the worlds simplest job unless you have very small hands, or you attempt to remove some of the screws and detach part of the housing.  If it's still covered under warranty, this might be something you just have Dell replace or fix...

I had the same problem 'carriage stall' as described here . Also my carriage was jumping about 2 inches at a time. After trying several different attempts to fix the problem I called Dell support and after a $39 charge I was told the the carriage aligns itself by shining a light though the ribbon. after cleaning the ribbon, my printer is working perfectly now. Hope this helps and saves you 39 dollars...... :)