Are you changing the whole belt unit or just the belt with the same belt frame.
Some times the frames get bent and that eventually starts sliding the belt to one side causing it to rip. If you are changing the whole belt unit and it keeps on doing it then you might have some parts either broken or damaged.
Take the Transfer unit out and with a flash light make sure the Belt lift assembly is not bent and it easily raises the belt up and down.
Take out the Image unite(make sure you protect them from the light) and put in one at a time to make sure you are putting them in correctly, make sure they light up evenly.
One last thing you might want to look at is the erase lamps to make sure they are not bent and are still in place.
Hope this helps......
Iteminconline
The black image unit of your machine should be replaced soon. It is a maintenance item and is very easy to change. They cost about $350 new, but you can buy one much cheaper rebuilt. Here is a video I made to help explain what it is you need to change and how to do it. Good luck
It is either the card, or the switch/router/configuration. Easiest thing to try is plugging the network cable directly into a laptop. Does it get an ip address? If the printer has a static ip address, try setting that on the laptop if it isn't using dhcp. Can you access the network/internet? If so its a bad card in the printer. If you can't, have your network administrator look at the port on the router or switch on the other side to make sure its functional and configured correctly.
The optical sensor looks at a small compartment, that has clear walls; when the waste toner gradually fills the container, it eventually reaches the level above a "wall" between the main container and this small compartment, spills inside and makes not transparent anymore. Some toner might have gotten there and the sensor gives a false full signal. You can get rid of it by cleaning this compartment with compressed air. Obviously, the sensor might be plain broken as well, but the above is perfectly true - it saves the day when the printer stops and we don't have a new waste container... I pour out the toner and clean the inside thoroughly with compressed air, especially that small look-through compartment.
