Hi my name is*****'m a consumer electronics design engineer. I can help.
How technical are you? This unit being in storage for so long could have numerous issues. The most common problems are dry belts and O-rings, although capacitors that aren't used for that long may be leaky (but maybe not), fingers crossed on that one.
If it's not turning the tape drive wheels, the most likely culprit is the drive belt (s)
If you're up for it, I can help you .
Just let me know ~Wayde~
Hi. Did you remember if this one worked before being stored? That one should have the whole tape unit come as a whole when disconected of all connector. Try to see if the belt are still there and that they have not desintegrated into a black goo. Let me know how it goes.