13 Apr
2010
13 Apr
'10
4:40 a.m.
On Mon, 12 Apr 2010, Tom Gardner wrote:
Wow, thanks! )^&)^*(&^% Google turned up zip in over an hour of searching
on every permutation of words I could think of...
Has anyone on
the list seen or work with one of these? I received a
Morrow M-20 8-inch hard disk along with my N* Horizon and found the
Memorex 102 disk mechanism inside (what a beast!).
I worked on the 101/102
See
http://www.bitsavers.org/pdf/memorex/disc/112-114.60-00_Memorex112_Fujitsu23
01_jan83.pdf for the Memorex 112 Technical Manual; the 112 is a later
version of the 102 and they probably have a lot in common. Paragraph 1.2.2
shows the typically current wave forms which should be the same. According to the spec the start up current is 6A peak
and 1.6A running. So
when running yr 10 ohm is only 1/4 watt and should be cool. The peak power
of less than 3.6 watts should only last a very short time as the motor comes
up to speed and it's back EMF lowers the current to the running current of
well under 1.6A (the running current supplies both the spindle motor and the
stepper motor). Again the figure shows a spindle motor start up current of
about 4.5A and the peak 6A occurs during stepping.
Good luck.
Thanks, I think I'll need it.
BTW, if you have an 102 documents I would really like
a copy, personally or
at bitsavers.
Don't I wish :-). I haven't given up yet and will keep my eyes open.
Again, much appreciated!
Steve
--