Just setup my MKIII on a vertical floor stand and am experiencing scraping noises on CD slots 1, 3, and 4. CD slots 2, 5 and 6 play just fine. No skipping and no physical damage to CD's occur. If I lean the unit back about 15° all CD slots plays fine. When I had tested the the unit it was horizontal and flat on a table and all of the CD slots played fine. Noticed this afternoon when I setup the unit on the floor stand that the centering CD mechanism was already configured for vertical instead of horizontal which it should have been. Do you think this is causing the scraping noises? Is there a way to further tune the CD centering mechanism or do I need to buy a replacement rocker arm? Any insight is appreciated.
UPDATE
It's been about 12 hours since I mounted the MKIII on the floor stand and the scraping noises for CD's 1 and 3 have gone away. Maybe gravity has settled in? CD 4 still exhibits this behavior occasionally. If I open the glass door, it will usually start scraping but not as obnoxious as before. I shined my flashlight on the CD clamp during operation and it appears the bottom of 9121 2854207 clamper arm is making contact with the CD 4. The bottom clamper arm is much closer to the disc than the top. Maybe it needs realignment? I also tried this particular CD on the other CD slots and it will occasionally produce a scraping noise as well so I believe the disc maybe slightly warped. Probably a manufacturing defect since I just bought it brand new.
