BBSHD Why a JST connector AND Higo?

[electricwheels.de]

The potting compound is called 'magic rubber', it's a 2-component mix and supplied by Raytech.

 

[banzai]

If you have the standard pot, clean it all with a small flat screwdriver, specially around the edges, till you can't see any pot. As you see, the pot is not really very sticky, once the edges are free, use the two screws that fix the heating transfer to apply force alternatively left and right, it will come out.

 

[fechter]

You should be able to pry up on the screws that hold the FETs on. Maybe bridge across the housing with a piece of metal to give a place to pry against. Once it breaks loose, it should just slide straight up.

The heat spreader bar has heat sink compound on it, so won't be glued to the housing along there. Use a skinny straight blade to work around the other edges to separate the potting from the housing. There shouldn't be much potting under the board.

Don't pry under the circuit board. There are lots of delicate little SMD parts along the edges.

 

[tmort]

I did make a puller out of a 3"PVC coupling and a little stainless steel.

For general information I thought I'd show how I did it.

I made a whole lot of holes as I used screws and nuts to help bend it to the inside of the coupling and then used Pop rivets to hold it together. To get the right curve I put some pop rivet washes in between the metal and the coupling. I used hot melt glue to hold the washers onto the metal.

A long magnetic tip #1 philips screwdriver and a lit magnifying visor helped a lot too.

Puller
https://drive.google.com/open?id=11z7aOBAOLni3hzRUp8xMiA50pCFzM-bu

Fresh Out of Casting
https://drive.google.com/open?id=1FOG5axOCmRG6yx7YXU-sjctQ5qHeIMAi

With the plastic and some of the remaining potting stripped away
https://drive.google.com/open?id=1ljkzUgAfnsLd5EdnGvxABSnvi_FwrDuS

 

[fechter]

Nice, thanks for sharing.

How did you apply force to the puller?

 

[tmort]

I just held the casting with one hand and pulled up on the puller with the other. I don't know if the picture shows it, but, I cut a hole in the coupling and had a pin going through it for a handle.

 

[fechter]

I just held the casting with one hand and pulled up on the puller with the other. I don't know if the picture shows it, but, I cut a hole in the coupling and had a pin going through it for a handle.

OK, I get it. I was thinking just hand pull might not be enough to get it out but glad to hear it's not that hard. Once the potting breaks loose, it should pull out fairly easily.

 

[tmort]

I was thinking that too and was going to attach the casting to a board with screws so I could step on the board and pull up. The wood was outside and I just tried it by hand before I got around to doing it.