11 Jun
2003
11 Jun
'03
3:31 a.m.
Peter Turnbull wrote:
Yes.
Yes, that is the plan. The motor has four wires.
On Jun 10, 22:23, Eric Chomko wrote:
I'll find out when swap the good board with the one on the bad drive.
I have been monitoring this new problem for a few
days. Actually,
it first surfaced weeks ago, but I had zero time to look into it.
Anyway, I have a three drive Smoke Signal Broadcasting disk system,
in which one drive, 2 (last one on 0,1,2 chain), has this nasty whine
when
powered on. The other two drives work and sound fine.
The faulty one's driver motor never stops when powered on whereas the
other two do.
Sounds like the motor control board is faulty. The others must have the last one due to the
terminator
which functioned correctly in the chain. I have managed to pull the
bad
drive and managed to get the two working ones to
work with terminator
resister moved to drive 1.
The terminator should be on whatever drive is last in the chain (the
end of the ribbon cable). I put 2's (bad drive) large electronics
board
onto 1's drive mechanism and it works fine. That leaves 2's drive
mechanism
as being bad; either the small circuit board or the drive motor.
Also, when 2 is selected the red LED does light up, but no diskette
can
be read.
Motors sometimes burn out, but other faults are relatively uncommon.
These motors normally have three or four wires; two are the power, and
the other(s) are the tachometer signal back to the control board; this
tells the control board how fast the motor is going. The tacho may be
broken, but a faulty control board is more likely. If one of the other
drives uses the same motor you could try swapping, which at least would
tel you whether its the control board or the motor itself.
The whine is probably because the motor is running far too fast, and
that is why you can't read a disk. Don't let it run like this too long
or you'll damage the motor.
Thanks.
Eric
--
Pete Peter Turnbull
Network Manager
University of York