powerpack repair. 2 cylinder motor

[raczekp1]

Hi.
looking for some tips how to open CDI powerpack.i know ded powerpack is becouse bad transistor but how to open this black box

 

[F_R]

You don't open them. But I was hard headed enough to try it once. Mine was potted with epoxy surrounding every part and impossible to do anything with . Your mileage may vary.

 

[ronward]

I opened one up once for the heck of it... It is filled with epoxy to dampen the vibrations so the interior components can't move around and get damaged. If you WERE able to get all that out you would probably damage everything in the process anyway. Less headache to just get a new one. How would you feel if you did all that work only to find out it still isn't any good?

 

[Tim Frank]

Kind of like doing an emergency appendectomy....on yourself.
If there is no other possible option.....maybe.
Otherwise, don't even think about it.

 

[raczekp1]

i heard that acetone can dissolve this epoxy in black box.going to try

 

[ronward]

Oh great...someone who will finally be able to rebuild a power pack for all of us. Sorry for the sarcasm but it's been tried over and over since the introduction of the power pack. Let us know how it works and then we'll all still buy new. There is a reason they still sell new OEM or aftermarket...it's because you can't repair them. At least, not reliably. If you figure it out you better patent it

 

[Tim Frank]

How do you get the acetone to stop dissolving stuff when it gets through the epoxy...it also has a healthy appetite for most plastics? PC boards, components coatings etc. will all be "in harm's way".
But go ahead, fill your boots if you are set on it....

 

[SolingSailor]

All of us electronics technicians are very familiar with the "potted" module.
Often the module is potted so as to keep secrets about the design.
Of course it also protects the contents from corrosion from contact with water and air. This is probably the case here, as the CDI circuit is pretty simple electronically.
But one thing we never do is seriously try to repair any potted module.
Sometimes we saw them in half for a joke, but that's about all we can do.

 

[raczekp1]

No Title

i put CDI unit in nitrol dissolvent for 1 week and all staff around electronics just gone

 

[raczekp1]

No Title

i put CDI unit in nitro dissolvent for 1 week and all staff around electronics just gone

 

[nwcove]

very interesting! i really hope ya do manage to repair it.

 

[orbanp]

i put CDI unit in nitro dissolvent for 1 week and all staff around electronics just gone

Interesting!

What actually is that "nitro dissolvent"?

The PCB boards are usually also epoxy based. What happens to them?
The picture is too small to see details.

Peter

 

[tblshur]

nice job , did you fix your powerpack, i ask because i have one that intermittently works , would like to try and fix. ive heard perservance is the mother of invention or something like that. have a good day.:joyous:

 

[raczekp1]

i used 1l of nitro solvent. I dont know proper English word.
soak cdi box for 1 week and this epoxy filing start slowly fall apart
soon i add some more pictures

 

[raczekp1]

i used 1l of nitro solvent. I dont know proper English word.
soak cdi box for 1 week and this epoxy filing start slowly fall apart
soon i add some more pictures

 

[raczekp1]

picture

 

[raczekp1]

powerpack electronics required to fix: 2 triac
and 1 thyristor. i spend less than 10$

 

[jasper60103]

edit: Nevermind. That wouldn't be ethical.

 

[SolingSailor]

Amazing. Does the label give the chemical name of the solvent?

 

[raczekp1]

nitro solvent is a mixture of toulen( 70%) and acetone (30%)= nitro thiner