I am borrowing a pair of Numark 1910's off of a friend. I have had them for a while and the other day one of them stopped turning. Granted they are pretty old but are direct drive, the platter wont turn and when you try to spin it with your hand it is really stiff. It made a slight burning smell as well. Has the motor gone on it or smoething and is there anything I can do to fix/ anywhere where i can buy a realtively cheap replacement and give them back to him.