Indeed, we remain in favor of our choice or this analyzer, and have of late had less such non-specific troubles. Recently, however, we had both the centrifuge and camera replaced and the machine has been functioning better than when first installed. The service rep reported that they have replaced many camera's, and that most such difficulties seem centered on this component - as would be expected. We have also learned that the centrifuge utilizes different RPM's for different functions, and that inefficiency here may well show first in the Anti-B well - likely owing to titer / avidity of the reagent. Of course these are our opinions, based upon a growing experience with the instrument. Technical support was most helpful in working through the difficulties. I too know nothing of the TANGO but hope to learn some day. HooRahhh