15 May
2007
15 May
'07
7:52 p.m.
Dave Dunfield wrote:
I've had to do this for a number of systems,
Cromemco being the most
notable ... I find slowing the drive by about 10rpm makes a huge
difference on some disks (One of the reasons I like TEAC drives -
very easy to set the speed).
That's nice to know - FWICT my modified YE Data drive is running at about
290RPM instead of 300 (based on the index pulse timing). Now I don't have to
try and figure out how to speed it up by another 10RPM :)
That said, the drive motor appears to be crystal-locked, so increasing the RPM
might be a little difficult anyway.
BTW Dave, thanks for the page on modifying 5.25" drives for 300RPM - the
method you mentioned worked like a charm. I'd post the wire colours for the
high/low speed switch, but the drive's downstairs. Basically, there's one line
that's always at +5.0V, one that's always +12.0V, one that's on/off depending
on the motor's state (on or off) and one that sits at around 4V. Ground the 4V
line at the motor controller board (and disconnect said wire from the drive
controller/head amp board first!) to get 300RPM.
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