Re: Help needed with - Racal Dana 9081
Hello Mark,
I'm not sure of the answer to that and I've just put the 10,000 screws back into the shields of mine! I suspect they are mounting pads, which just space the transistors from the PCB but I could be wrong. A gentle tug will answer the question for you.
You don't need to remove the transistors for a quick test. All you need to do is to use the diode test facility on your DMM. Check from base to emitter, and base to collector, both ways around. An NPN transistor will conduct when the base is connected to the positive prove of your DMM, an NPN transistor will conduct when the base is connected to the negative probe. The other way around will show a higher resistance.
The tests aren't entirely sure fire but is better than removing the transistor with the risk of damaging the PCB. If the transistor shows a short or an open both ways around it is faulty for certain.
Paula
|