8650 waste tray stuck

You will have to pull off the casing to get them unstuck and then replace the casing. Pretty easy to do.

It sounds as if the drive belt or wheel that controls the carriage has perished and failed. There is normally a micro switch on the side or rear of the tray, that senses the presents of a casset. If it is closed with stikky tape or clay you may be able to simulate a casset in the machine and with manual force help the casset to open or close. alternatively a small lamp in the centre of the tray senses the tape. then you have to cover the lamp or two sensors on left and right side of the tray, to prevent detection of the broken or missing tape.

Are you sure you are looking at the waste tray, and not the paper tray? Here is a link to the user manual for the printer. Information about the waste tray is on page 194. This should give you an idea of were it is located.
http://download.support.xerox.com/pub/docs/8510MFP/userdocs/any-os/en/user_guide_en.pdf
hope this helps

A replacement is needed for the following parts:
40X2838 Media (ACM) drive assembly40X5930 Media feed ACM clutch CBM40X2853 ACM drive shaft assembly
Please contact Lexmark Technical Support for further assistance.

The waste bin full error can occur if the waste bin was not removed from the machine for over 10 seconds when it was emptied. Please remove the waste bin and wait for a full 10 to 20 seconds before replacing the Waste bin.

If the message still displays turn off the machine and leave it off for 1 minute then turn the machine back on.

Then run software update to make sure you have the latest OS updates.

Then delete the printer and re-add the printer.

You will probably have to remove the left side cover and clean some spilled ink from around the waste tray.
That normally is what causes that.
There is a tray lock on the machine, but I personally have not seen that be an issue.
If there is a lot of ink in the machine. make sure after you clean it out, that you level the machine front to back and side to side. You do that by placing a level on the glass and level it up by that.

Photo walk through here shows how to access waste pads

http://www.inkrepublic.com/KnowledgeBase/R260WasteInk.asp?C=0

Also shows how to replace with a bottle to collect waste ink

Maryar,
The tray may have got stuck. It happens. What you can do is look for a small hole on the face of the drive, either on the tray front or just below it. Insert a paper pin through it. The pin will press a lever which will open the tray. If you do it a few times the tray may get unstuck finally. Hopefully.

My 8560dn showed that message - it was not a heater or anything weird. I removed the waste tray; emptied it and re inserted - and rebooted the printer. it spent quite a while cleaning - but it prints fine now.
the waste tray was 'stuck'. To remove, I first removed the maint kit and then with a flashlight shined inside, saw there was a lever on the right side which, when I moved it, released the waste tray. Voila - road to success (and no service call). Have a spare set of ink on hand as it uses a bunch going through the cleaning process.
This turned a useless paperweight back into a productive member of my office society.

its a hardware error.