Common error with used devices: The cassette compartment opens after closing again by itself, a playback of a cassette is no longer possible. The reason for this is a worn-out rubber belt for the engine, which opens and closes the cassette flap. With a new belt, the device works properly again. New belts are offered on eBay. However, changing the belt is quite time-consuming, since the drive has to be removed to the front and partially taken apart to get to the belt.