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L6 code means the motor is not working. You need to replace that, which means replacing the entire laser module. They can be gotten cheaper used from your local sharp dealer. I know this because I work on these things every day, being a certified sharp tech. L6 code means motor lock or motor sense dead, not necessarily laser dead.
U2 is normally a user error (hence U) check that all the doors are closed fully and just recheck the toner installation. If this is all correct it might be a slight possibility that the toner cart is faulty.