Check any potential purchase using a disc you know to be in good order. Also, use a disc that adheres to the Red Book standard, as some early players do not work well with CD-Rs and CD RWs. Make sure the disc is read briskly and that playback starts quickly. If the machine takes an age to get going, it could mean worn optics and/or transport problems. Check that the drawer operates smoothly and that both channels are present and at an equal level. If the machine had a remote don't pay top money if it's missing. They can be hard to find.
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