I serviced this deck and bought a new set of belts that cost 50 delivered to ensure that they were quality and not cheap Chinese ones. I cleaned and lubricated the transport. Adjusted the speed and the azimuth and I also calibrated the frequency response for each tape type for playback and recording. The one issue it has is that the button to turn the Dolby noise reduction on does not stay engaged. When I recorded with the deck for testing and calibration I just used a book and left it next to the switch.