Jack, Proper rack spacing is critical with those instruments. I had a similar problem with my own 330E. The pitch of one note was flying away when rack no. 1 whas closed. I noticed that the bottom racks retaining screws had been moved. I simply removed the existing spacers and replaced everything with metal bars, for both top and bottom spacers, giving the maximum possible clearance between the three racks. I could send you pics if wanted.... Also, one has to be very carefull when assembling a cable to those 5 pin connectors; it is easy to get a short there!...Double check insulation before assembling the cover with the plug. Jean