I found a pristine condition 810 that appears to have little use, but it will not run properly. The first thing I noticed is that it does not have the Grass Valley board set (analog data separator on top of MPI or the new rear power board). Plus the side board has a big RF shield box. I can get it to turn on but it just pulls the heads to to outer stop position. If you request data, it spins, but the head does not move. The heads can move if I push them and if I move them to the inner stop position, it will retract them "smoothly" to the outer stop when powered back up, but no data. Is this a symptom of these early 810 boards that caused so many failures that forced Atari to the Grass Valley board set? Again, the MPI mechanism is in amazing "like new" shape. I image the reason this unit looks new is that it failed early on and remained in its 810 box ever since. My question is; do you think the MPI mech is still good? If so, I have another functional 810 that has an MPI that works, but is not long for this world. I'd just swap the MPI from the early 810 into my working 810 that has a tired MPI mech. Are all MPI mechs for the 810's interchangeable? That being, can I take an MPI out of an early 810 that didn't have the Grass Valley board set and remove and replace it with one that does. This MPI has 4 cable sets (connectors that plug into the read and side boards). Any suggestions would be greatly appreciated.
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