[cctalk] Re: Repair procedures

[Jon Elson via cctalk]

OK, here's a VAX 11/780 story.  We had a 780 installed about 
1980-81, it ran quite well for some time.  After it was a 
year or two old, it started crashing.  DEC spent some time 
going through logs, brought in a special team to do a time 
domain reflectometry of the SBI, and couldn't find 
anything.  While DEC was running diags on the machine, they 
had the back doors open, exposing the backplane.  I started 
studying the maze of wire wrap wire. Suddenly, I found a 
wire that was caught on the point of a wire wrap pin.  I 
called to the FE, "hey, I think I found something." He said, 
"don't move it" but I had already lifted the wire off the 
point.  The machine ran perfectly for several more years!

Jon