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Can you please remove the power to the printer (so unplug it from the power socket).
Then wait 10 minutes, connect the power again to the printer, turn it on and tell me please if it is now operating correctly.
Let me know the results please
If you power it off, can you then open the tray?
Ok, there is no actual locking of the tray by the machine so it will be the paper thats causing it to get stuck, but you need to try to pull it out.
How much force can you apply?
I double checked and there is no specifications on a lock on the paper tray on this model
What tells you it is locked?
Ok, but this does not also lock so what tells you its locked?
Can you remove any of the paper trays?
ok, open these and check where the paper is feed into the machine for anything stuck there.
Do you see anything?
you need to speak to customer service regarding costs, I am only an engineer here.
Let me know when you have