Some progress with my PDP-11/73 system
pete at dunnington.plus.com
Tue Apr 10 07:45:54 CDT 2007
On 10/04/2007 13:17, David Betz wrote:
> Three of the four failing drives were official DEC RD53 drives as
> indicated by a sticker on the top. Interestingly, when Iooked at R7 on
> the PCB, two of them had the resistor present but one end had been cut.
They've probably been cut in order to use the drives on a PC.
> I soldered it back together but both drives still fail. At least one of
> the drives spins up but then back down again.
That can happen if the heads are stuck against the end stop inside the
drive. There's a rubber bumper that goes sticky. Alison posted more
information about that just a few days ago.
Pete Peter Turnbull
University of York
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