Re: MFM drive gone nuts

On 22/07/2014 5:07 PM, Michał Pleban wrote:
> Hello!
>
> MikeS wrote:
>
>> It sure does sound like a power supply issue; I've seen very few drives
>> that would not spin up when power was applied (except in cases where the
>> head(s) were stuck to the platter(s)), but I've seen many instances of
>> the power supply being defective or shutting down due to too heavy or
>> too light (!!) a load.
> That was the case with the 610 power supply which was too weak to spin
> the drive, but the 710 power supply worked well. I sure hope I did not
> stick the heads to the platter when I was moving the machine... on every
> power up the drive backed up the head to the "0" position so hopefully
> it was not the case.

Cracking stiction is easy, just hold the drive firmly and give it a 
couple of short sharp flicks with your wrists in the direction of 
platter rotation (either way, just don't do it vertically), but that is 
unlikely to be your problem IMO.

>> The power connector was also pretty flimsy on some drives and would fail
>> after plugging it in and out a few times.
>> Definitely check both +5 and +12 on the drive's PC board at the connector.
> The connector looks good and at least the +5V is applied because the
> drive board reports the error. I will unscrew the board from the
> mechanics and measure the +12V in various places.
>
>
Sounds like a plan.



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