Tony,
do you have specs for these drives ?
I have got a Micropolis 1222-I drive but there's nothing to find about it in
the net.
All I would like to know is the interface (SA1000?) and the voltages needed
for the power connector.
Pierre
I'm going to guess Micropolis. Those drives were
absolutely crap.
On the other hand, older Micropolis drives -- the 8" 1200
series, weren't
too bad. I've had electronic failures on them, but they're mostly
standard chips, and there's a handy diagnostic connector that you can
connect a lights-n-switches box to to find out what the main problem is.
Siad box is _very_ easy to make...
THe only problem with the 1200 series is the servo power amplifier. It's
an LM379 chip -- a dual 6W audio amplifier (now, what was somebody saying
about no audio amplifier discussions here :-)). A standard part at the
time, but just try finding one now. And this circuit uses a feature of
the 379 -- namely that the bottom end of the output stages are brought
out separately -- to monitor the servo coil current. About the best
replacement is a pair of mono audio amplifier chips, I think.
-tony
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