4 Feb
2007
4 Feb
'07
3:56 p.m.
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.
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.
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?
-Dave
--
Dave McGuire
Port Charlotte, FL