> what is the failure mechanism of all these conductor plates? It seems to be 
> so common. 

The Duh answer is: bad connections.  I say Duh, because those plates are 
essentially
nothing _but_ connections.  The two speed sensors are just coils of wire, so if 
one opens
up... bad connection!  The solenoids are separately replaceable, the plate part 
is
just: connections.  Connections that live in a hot vibrating oil bath, how is 
THAT a
good idea?  :-)

With electronics, once they figured out how to make durable silicon and the 
like,
which they didn't always know how to do wrt electro-migration and poisoning,
if it didn't smoke (silicon, mostly) or dry out (capacitors), if it stopped 
working it's
due to a bad connection.  Somewhere.

Similar to a mechanical adding machine.  99% of the failures are lubrication 
failures.
Not that knowing this really helps you very much.  There are a LOT of 
lubrication points
in something like a rotary calculator, and there are a LOT of connections in 
electronics.

It does not help that modern construction uses smaller traces than necessary for
low-performance parts, which are more fragile than the older, larger geometries.

-- Jim


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