What is this diode ?
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dshoaf
That high voltage buzz
What's in the schematic. Judging from the components around it, I'd suspect a power supply circuit is involved.
This could indicate that you're potentially dealing with a zener of some sort. In this case, you'd have to de-engineer the circuit to determine what it would need to be.
It could also be a blocking diode of some sort, since its tied to a resistor, which makes it look like a retrofit of some sort.
It all depends on how its wired up. What's the problem with the unit?
Cheers,
David
This could indicate that you're potentially dealing with a zener of some sort. In this case, you'd have to de-engineer the circuit to determine what it would need to be.
It could also be a blocking diode of some sort, since its tied to a resistor, which makes it look like a retrofit of some sort.
It all depends on how its wired up. What's the problem with the unit?
Cheers,
David
cademan
Lunatic Member
The best way to check that diode is to un-solder one leg from the circuit board. If it is good, it will read on an ohmmeter in one direction only (meaning switching the probes around). If it reads in both directions, it is shorted. If you get no reading in either direction, it is open. What I want to know is why do you think that diode is a problem? Is it blowing fuses? Is one channel distorted? Is a protective circuit kicking in?
The amp is working perfectly.
The eletrolytics caps are new. (the problem was here before).
The 4 outpout transistors are new : one was bad on the other channel. On the good channel, the original transistor was also very hot.
All the transistors have been controled and also all the resistors.
The diode have been un-soldier for testing it : no reading in either direction.
The eletrolytics caps are new. (the problem was here before).
The 4 outpout transistors are new : one was bad on the other channel. On the good channel, the original transistor was also very hot.
All the transistors have been controled and also all the resistors.
The diode have been un-soldier for testing it : no reading in either direction.
I did that here when I was 4 years old. :nono: My mom keeps telling me to this day, you burned two notches in that quarter, I should've kept it! 
Nakdoc
nakamichi spoken here
The 1N4007 is the highest breakdown voltage of the series. 1N4002 is easiest to find and works fine in this application. Since the diode is near the bias pot, it probably caused the bias transistor to turn completely off, maxing out the bias. Bias pot typically turn the bias transistor on. The more the transistor is on, the less bias there is.
