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I have seen and helped with dozens of them. All had blown caps and bad solder joints. Some also had open power transistors and/or burnt wires. The caps fail because the have too low a working voltage spec and just can't hold all of that energy in so they explode. It has been most expediant to repair what we have but the ultimate would be a "plug and play" replacement using better quality components and instead of using comparator technology, using PC controller technology. More and better filtering and protection should also be part of the design goal. For instance, if the wiring gets burnt or a solenoid coil shorts out there is no output protection for the power transistors so they die too. A "sport" mode would be nice and some kind of manual mode like Tiptronic would be nice. An indicator so you know what gear you are in is also a nice touch. It can also become a "limp home" type of shifting if the controller decides to cr-p out. Another feature could be an electronic speedometer. Of course it starts to become an economic issue as to how much you want it to do besides the basic shift control function.
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, "twinenginedmc12" <twinenginedmc12@...> wrote:
> Hi Dave.
> I've only ever seen two failed ones.  Both had electrolytic capacitors that failed from what looked like excessive heat.  Don't remember the consequences.
> My hat is off to Jeff Angwin, who came up with the clever idea of just leaving the old board there and just adding the new one.  Wish I had thought of that.  It's a very winning idea.  I was fixated on a solder in direct replacement, which didn't seem practical.
> If I can be of service to you mad scientists making the replacement, please let me know.
> Rick Gendreau.
> --- In dmcnews@xxxxxxxxxxxxxxx, doctorDHD@ wrote:
> >
> > You've got to find out what is ruining your governor.
> >  
> > Are you sure they are really bad?
> >  
> > What are you doing to test them?
> >  
> > 


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