4 Feb
2007
4 Feb
'07
4:48 p.m.
Dave McGuire wrote:
9 times out of 10, that was the only replacement required. If you were
unlucky, you might also lose the MC3470, but I only ever had to replace
about half a dozen of those.
--
Pete Peter Turnbull
Network Manager
University of York
On Feb 4, 2007, at 4:05 PM, Tom Peters wrote:
> Before even letting the customer leave the premises, I'd quickly take
> out the four screws that held on the cover and show them the blackened
> spot on the inside of the cover, then show them the 74LS125 in the
> middle of the board, which invariably had been cracked or cratered.
I remember it well :-)
> The documentation clearly said, connect the ribbon
cable to the
> controller with the cable exiting AWAY from the board. But there were
> any number of folks that went the long way around, and put a great
> deal of effort into bending the cable sharply where it exited the ID
> connection, so that they could plug it into the controller card
> backwards.
Or the right way round, but one pin displaced, sometimes.
This usually
resulted in a spectacular failure of the '125.
Did that failure take out anything else, or did replacing only the
74LS125 solve the problem?