Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
Optoelectronics Scout 40 with reverse power damage
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 --------------------------------------- Amateur Astronomy Page: http://www.angelfire.com/alt2/nightrunner/skyview.html Our Webcam: http://web.infoave.net/~missy1/cam/webcam.html |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
1 to 3 phase converter power factor question | Metalworking | |||
pc power supply failure? | Electronics Repair | |||
Quality Of Tools | UK diy | |||
Power cost of idle electric water heater | Home Repair | |||
Old Man Winter Will Hit Us Tonight! | Home Repair |