16-03-2014, 12:24 PM
Perform the six basic checks to see if the transistor has been physically damaged. Check the resistance between the base and emitter, in both directions. It should be less than 100 ohms in one direction and more than a thousand ohms in the other direction. Perform the same two tests and look for the same results between the base and the collector. Finally, check the resistance in both directions between the emitter and the collector; these two tests should show that the resistances are both greater than a thousand ohms. If you do not get these results, the transistor has been damaged.
Read more: http://www.ehow.com/how_8166170_check-tr...z2w7vnslrW
1 of the 2n3055 The 2 terminals the ends of the wires looked as if they had overheated. I tried the tests above on this transistor no reading in one direction from both terminals to collector (screw fixing terminal) the other transistor read low in one direction (changed probes) and high in the other direction as basics tests above.
I also tried the voltage checks again with mains on one of the 2 orange parallel caps (35v 3000 ohms ) started to leak. i have ordered new radial caps 35v 3300 ohms ok i will order new transistors also. keep you informed.thank you richie.
Read more: http://www.ehow.com/how_8166170_check-tr...z2w7vnslrW
1 of the 2n3055 The 2 terminals the ends of the wires looked as if they had overheated. I tried the tests above on this transistor no reading in one direction from both terminals to collector (screw fixing terminal) the other transistor read low in one direction (changed probes) and high in the other direction as basics tests above.
I also tried the voltage checks again with mains on one of the 2 orange parallel caps (35v 3000 ohms ) started to leak. i have ordered new radial caps 35v 3300 ohms ok i will order new transistors also. keep you informed.thank you richie.
