31 Jan
2008
31 Jan
'08
6:02 p.m.
All,
I am trying to ID a chip from a SFD-1001 motor control board. This
is printed on the chip:
JAPAN SERVO
SA1001
3A
It looks like a normal DIP, except for the middle pins which
look to be twice as wide. Is this for heat sinking? I have tried
Almost certainly yes.
Is this one of those direct-drive spindle motors, commonly found in
half-height drives/ That chip sounds like the device that takes in the
signals from hall effect sensors (which detect the postion of the rotor)
and sends current through the 3-phase motor windings.
The full-height 3.5" SOny drives that HP used (and which I get to
repair..) used something similar. In that one, the chip was a standard
part, used in some VCRs, and I amnaged to get a replacement. Over the
years I've hard on chip fail and one hall sensor fail.
Alas I have no idea where to find data on your chip, but I will keep on
thinking. Why do you suspect it's faulty?
-tony