I have a problem with the sound on my Marantz SD 400 Tape deck as seen below in the linked video. Any thoughts on what may be up? I have cleaned all of the mechanical contacts and switches on the front as well as all of the ones on the circuit boards. During play or record I am not able to hear audio or record audio. The meters never register and audio signal. Can this be a circuit board component that has failed?
https://photos.google.com/photo/AF1QipNY93uPE39pwAt5JhIlN786Kbr6ZqnGLXxk5EGa
https://photos.google.com/photo/AF1QipNY93uPE39pwAt5JhIlN786Kbr6ZqnGLXxk5EGa
