I don't have the main unit, so I haven't been able to confirm its operation. It worked when I bought it about 20 years ago. Since the operation is unconfirmed, please consider it as junk. There are scratches and stains on the disc. This is a used item, so please refrain from bidding if you are looking for something close to new. Please judge the condition from the photos. There may be scratches that cannot be fully captured in the photos. Please understand and bid. By bidding, you agree to these terms.