02-19-2014, 09:42 AM
Ron.
1. Do the test without load. This will tell you clearly where the current goes when your voltage shifts.
2. if it is OK, just swap the caps. Or better yet, change the cap - you should have something like this in your stash somewhere.
3. Test the output transistors. Q8.
Last. You do not really need a transistor tester. I never ever needed it. Analog ohmmeter is all you ever need. THhis makes it quicker.
test transistors only outside the circuit, having unsoldered the wires if it is a power one.
Keepeing it on x1, Test BE forward-reverse, should be NO LEAKAGE (the arrow should not move at all when reversed), do the same with BC, and then EC both ways (no visible movement should be present). This pretty much means the transistor is good.
That goes for any transistor, power or small signal.
1. Do the test without load. This will tell you clearly where the current goes when your voltage shifts.
2. if it is OK, just swap the caps. Or better yet, change the cap - you should have something like this in your stash somewhere.
3. Test the output transistors. Q8.
Last. You do not really need a transistor tester. I never ever needed it. Analog ohmmeter is all you ever need. THhis makes it quicker.
test transistors only outside the circuit, having unsoldered the wires if it is a power one.
Keepeing it on x1, Test BE forward-reverse, should be NO LEAKAGE (the arrow should not move at all when reversed), do the same with BC, and then EC both ways (no visible movement should be present). This pretty much means the transistor is good.
That goes for any transistor, power or small signal.
