"NightRunner" wrote in message
...
Hello all,

I took a chance on buying a Scout 40 (a frequency counter/recorder
made by Optoelectronics) used on Ebay, knowing full well that it was
inoperative due to the original owner using a reverse polarity power
supply by accident. My thinking was that it would be something simple
like a blown diode or internal fuse. It was NOT a fuse or diode, but I
did spot a badly heat blistered transistor like component. One oddity
about this whole affair is that while I was experimenting upon the
dead frequency finder, it actually powered up and began to run
normally, so I know that the majority of the electronics must be fine,
but then it failed and I have not been able to raise it from the dead
since let alone find out what I did to make it run to begin with.

Anyways, it's early morning and I am babbling. What I really need is
help identifying and replacing this part:

http://www.projectradiantlight.com/S...ansistor_1.jpg

http://www.projectradiantlight.com/S...ansistor_2.jpg

The part is just below the leftmost switch between it and a large
mounting hole in the main board. It appears to have the same case
style as a common surface mount transistor with the exception that it
has five leads, which I am totally not used to seeing. The part number
is "U13", and is marked L01B. There is a central heat blister
indicative of catastrophic internal damage, and surely must be dead as
a hammer, and it is indeed in the area of the main PCB that is
responsible for power input and charging control.

Anyone who can help me a bit with this, please do. I will be eternally
grateful if I can ressurect this $360 (when bought new) item!

Thanks MUCH for any help!

Rick

"The usual approach of science of constructing a mathematical
model cannot answer the questions of why there should be a
universe for the model to describe. Why does the universe go
to all the bother of existing?"

- Stephen Hawking


U is a common designation for integrated circuit. i would go direct to the
company first.
http://www.optoelectronics.com/

they might send you a schematic as a courtesy.