[sdiy] help me with a Moog Source, please

[Roy J. Tellason]

On Saturday 16 September 2006 02:27 pm, Chris Manders wrote:
> I haven't come across your problem before, but I know
> the Moog Source power supply is very often the source
> (cough) of problems.

Let me add to that...

I used to be a Moog service center.  They had problems in that area on a 
number of instruments,  another one that I can recall offhand being the 
Memorymoog.  Here's the deal:

Some instruments were made with things like regulators and pass transistors 
mounted to a heatsink,  and connecting to the board via sockets.  The problem 
resulting from this was that thermal effects cause enough rubbing through 
expansion and contraction to wear the plating off the socket contacts and 
cause a poor connection.

So they stopped using them and sent out a service bulletin to the effect that 
if you had an instrument for service those sockets should be removed.

Only problem then was that the way most of them acted with directly soldered 
connections was that thermal stresses (again!) would after a while pull the 
leads right out of the parts.

So they sent another service bulletin out saying that the component leads 
should be extended somewhat,  giving an "S" curve,  with some thinner wire. 
This wire would take up the flexing over time,  would not stress either the 
solder joints or the component leads where they went into the package,  and 
would normally be the end of the problem.

Moog was the only company that we worked with that wanted me to buy a 4-1/2 
digit DVM.  They wanted those power supplies to be set _that_ exactly.  You'd 
think that if they considered them to be that critical that they'd have made 
the design of them a little more robust...

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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