Meat Plow wrote in message
...
On Sat, 02 Aug 2008 11:01:41 +0100, N Cook wrote:

Intermittant / vibration problems
Models that use 0.15 inch power connector interboard connections , loads
of them for signals, control and power between 2the 2 main boards.
Otherwise neat idea, line of sockets on each board and then the line of
pins that would normally by soldered to a board used to bridge the 2
sets
of sockets.

The old problem of the pcb holes too large for the solder part of each
connection plus not enough solder.
End result , eventually microscopic rings can form around the periphery
of
the holes.

Peavey has been using these for years in most everything they make if I
understand your description. I've not notice a common problem and I
own/owned a lot of Peavey gear.



The one in front of me has not been obviously abused. There is a bit more
rust corrosion on the rear panel connectors than I would like to see,
perhaps stored in a shed or garage over a winter - but that should not
produce these ring failures. Because there is no conventional rigidity
locking the boards together , ie the pin arrays can move at both ends then
that should be fairly immune to being heavily leant on or similar.
No its oversize holes that are the problem here. The tails from each socket
pin are thin strips and should have small slots , not holes the diameter of
the strip and a bit, in the pcb, so no unreasonable unsupported solder. Just
normal thermal movement presumably causes those to fail.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
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