Thanks Tony and Joe!
Just before dinner I powered up the drive again. After the 30second spinup,
the heads move out to cylinder 0 and the drive ready light comes on.
I tried very gently moving the head assembly both forward and back. The
thing wouldn't even think about moving. I applied more pressure (a pretty
fair amount IMHO), and the head assembly still won't budge at all. I hit the
unload switch and the drive starts to brake, but the heads don't retract. I
immediately move the heads back manually and all is well (at least no
further HDI).
After dinner I'll start double checking the power supply voltages. Thanks
for any and all input!
Jay West