On 1 Nov 2009 at 12:40, Fred Cisin wrote:
Bizarre speculation:
Since most 8" drives use 24V, is there a possibility that this is a
5v&12V drive design, with the 7812 there to adapt it to 24V?
Is there ANYTHING on the drive connected to that pin of the connector
that does NOT go through the 7812? If not, could you feed it
relatively clean 12V downstream from the 7812?
That's the way the Tandon 848 works--there's an on-board jumper
around the 7812, so you can run it on either +24 or +12. (FWIW, this
is a drive with a +12VDC spindle motor; not the usual AC line-powered
one).
--Chuck