How to save two Mitsubishi M2896 drive (spindle motor smoked!)

Brent Hilpert hilpert at
Fri Mar 20 20:41:25 CDT 2015

On 2015-Mar-20, at 12:26 PM, Enrico Lazzerini wrote:
> Thanks BRENT!!!! Thanks for the schematics.
> Well the problem were 3 solders. After to insert the D102 zener (maybe
> 12,5V) and the resistor R112 (180ohm) on their position it I set the 3rd
> wire to the ground, the pin7 of c358c change its level. I reconnect also the
> transistor Q101. The spindle motor do not want to work.
> I remember that pin 1,2 and 3 were soldered even on the component side of
> the PCB so I would wanted to try to solder them again: the spindle motor
> begun to rotate. What emotion!!!!
> I not know if it rotate at the correct speed cause I have to rebuild on a
> table my old pc an to connect the 8" drive to see if with IMD software I
> will can to read a 8" floppy disk correctly, but at this moment the spindle
> motor works again!!

Great; if the 3rd-pin motor control does work then the 358 is likely OK and the speed regulation (that uses the other half of the 358) is likely good as well.

More information about the cctalk mailing list