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1541 Mitsumi drive operating way too fast!

I think I am at a dead end on this unless someone has parts or is willing to take a crack at it. If you have parts please PM me but it likes like I hit a wall on this.
 
Do you want me to try to do any sort of testing? How do these “know” what rpm they are running at without an index hole sensor?

Do you want me to send the entire drive (removed from the housing) or just the board and motor.

E6279495-83A1-4A81-B486-F68588FDB7B4.jpeg

Send me a PM with your shipping address and I’ll send you this one. It’s of no use to me with a bad head.
 
I guess you can send the whole drive (without enclosure). it would be easier and the whole thing shouldnt weigh too much
 
Sorry for necroing this post, but I hav exactly the same issue with a drive. It is „only“ running 20% fast (on the slowest setting), but it doesn’t properly read disks either.
Did you ever manage to get it to work again? I will try to compate the tacho signal of the broken drive and a working one. I though this sounded rather plausible.
 
I was working all over the previous week on the 1540 drive which was too fast. It had over 460rpm instead of 300rpm. I read this thread and have checked everything what is suggested here. This was a drive with alps mechanics but the problem was the same. I have checked the tachometer on oscilloscope and i have discovered there was no ac signal. After disassembling the motor I found the ferrite core was loose and it did not spin together with engine pin. I attached it and glued to the pin and the drive started working.
 
Happy for the new interest. But this issue I was having was over 3 years ago and the drive has been in a box in pieces in my crawl space (I just saw it yesterday while looking for something). Its not anything I will be getting back to after 3 years. It needs a new drive mech and thats where it stands. It would be interesting to see if someone else who experiences this problem finds a solution for it so I will keep watching this post.
 
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VERAULT said:
Happy for the new interest. But this issue I was having was over 3 years ago and the drive has been in a box in pieces in my crawl space (I just saw it yesterday while looking for something). Its not anything I will be getting back to after 3 years. It needs a new drive mech and thats where it stands. It would be interesting to see if someone else who experiences this problem finds a solution for it so I will keep watching this post.
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Did you open the motor and checked the tachometer ferrit?
 
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