10 Dec
2017
10 Dec
'17
4:26 a.m.
On 12/09/2017 09:14 PM, Brent Hilpert via cctalk wrote:
On 2017-Dec-09, at 6:06 PM, allison via cctalk wrote:
That was my thought and I checked, not the problem.? I suspect that the
magnets in the rotor
have gotten really weak.
Allison
On 12/09/2017 07:52 PM, Fred Cisin via cctalk
wrote:
How about a problem
with the current supply to the motor, such as low gain in the driver.
A progressive failure may be just on the edge of supplying enough current to keep it
rotating, but not enough for startup torque. On Sat, 9 Dec 2017, allison via cctalk wrote:
Functions normally save for the motor does not always turn on command
but will if manually pushed. All other functions are normal. I have several Epson PX-8s and i used them.. They
work well with the
various wedges I have.
I also Have a PF-10 which is the portable 3.5" 40 track two side floppy.
The problem is it randomly does not turn the media unless I give it a
push to get it turning.
Things checked:
* Batteries, NEW fully charge (Both).
* internal Power supplies, current voltage and bridged with external
supplies does not help.
* media checked for binding, it does not.
When it turns it reads and writes correctly and at the correct speed.
It may do so without help for many tries then will stop required a
manual push.
At first glance I though there were motor bearing issues but have
verified
this is not so. If I force motor on and restrain it I has good torque
and no
dead spots. All signals in the motor control look good on the scope.
Any thoughts?
How does it detect the presence of a disk? and/or disk change?