I don't own any cassettes or reels so I don't really know what to do about those units - I can verify that things power on and light up but aside from that I am at a loss - of these units, the ones I am focusing on for restoration and evaluation are the SPEC-1, SPEC-4, SG-9500, DT-500, PL-570, RG-2, SR-303, and the two KLH processors.