"Peabody" wrote in message
...
While the pop-up flash on my Canon XT camera works fine, the hot
shoe doesn't work. So I took it apart, and found a discrete
transistor near the hot shoe, with one lead going to the hot shoe
center-pin connector, one going to ground, and the third going off
into the circuit bowels.

So I'm hoping this transistor is bad, and that's what's causing
the problem. The number on it is K2715P, which I assume is
2SK2715, a 500V N-channel MOSFET. That would make perfect sense in
this application.

But the problem is that the transistor is soldered onto that amber
flexible plastic stuff that passes for a PC board these days. I've
never attempted to desolder or resolder anything to that stuff. I
have a 30-watt iron. Can anyone give me advice on that?

An alternative would be to wire in the replacement in in parallel
with the existing part, probably just soldering to the old part
leads and trying to stay away from the plastic PC board as much as
possible. If I have room to do it that way.

And finally, this transistor appears to be pretty obscure, and
while Mouser carries it, it would be nice if I could use something
I'm more likely to find locally - an NTE part perhaps. It wouldn't
really have to have a 500V DS rating. As a practical matter, I
think 50V would be plenty - modern flashes don't go over 12V. So if
anybody knows of a common N-channel MOSFET that might work, please
let me know. But it has to be small. The body of the old one is
6.5mm wide.

Thanks for any help.



Can't you just snip off the body and solder the correct transistor (quickly)
to those leads? Clamp something on the leads as a heatsink first.

p.s. There is no way I would ever substitute a 500v rated component for a
50v one.



Gareth.



Gareth.