I've attached a photo of a 682 ZX with the cassette door removed, your CR-5 should look similar. I *think* the playback head azimuth is adjusted with the white screw on the far right below the pinch roller(NOT the screw directly below the PB head!). The white screw on the left is for record head azimuth, which you do not want to adjust for playback these tapes of course. Please wait until someone confirms it before you start adjusting, as I've only done this on a Revox deck before, not on a Nak.