3 Jul
2025
3 Jul
'25
3:52 p.m.
On Jul 3, 2025, at 2:26 PM, Wayne S via cctalk
<cctalk(a)classiccmp.org> wrote:
That’s a good business practice anyway. You want your high price system up and running as
fast as possible, so not having to do more than cursory diagnostics is a good thing I
think deck realize that with the VAX and it’s remote the diagnostic capability as for the
board breaks, IBM used to do that for all the boards they replaced. They even had a
special board breaking tool.
My CE from IBM said that it costs IBM more to diagnose a faulty board than it does to
make a new one so that’s why they do it. Breaking the board also ensures that the
engineers won’t get caught up in a side project trying to figure out what went wrong.
That's true for problems seen occasionally. When people realize a particular issue
appears "too often" it does become an engineering matter, because then it
indicates an issue with design or manufacturing or part selection.
For example, I remember a product that had a memory backup battery issue, which turned out
to be a change in plating for the battery holder. For engineering it turned into an
exercise in learning what "electrovoltaic series" means -- not something
familiar to most digital logic EEs.
paul