Some progress with my PDP-11/73 system

[Pete Turnbull]

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
						Network Manager
						University of York