Hi! I just signed up for the forum. I’m a beginner and I do electronics from a hobby. I'm trying to fix an old Tesla AZS 217 amplifier. Maybe you can help me with the amp problem.
The right channel does not work on the amplifier (output transistor KD602 is defective). KC507 is also defective.
In the diagram you can see the voltages I measured before replacing the listed transistors.
Since I don't have a KD602 at the moment, I switched the correct transistor from the left channel and I replaced the KC507 with a BC547C transistor. It was supposed to be just a temporary solution and for testing purposes until I get the original transistor. When I turned on the amplifier to test it the transistor and resistor R27 smoked.
I tested all the transistors and diodes on the right channel later and they are all correct. Resistors R44 and R43 are correct. C23 instead of 500µF measures 1150µF (ESR = 0.56 Ohm) and C22 has trouble measuring. Out of 10 measurements, maybe 2 times he manages to get the value. The rest is reported by the damage part. When it manages to measure C22 = 55µF and the ESR is 2.5 Ohms.
Can anyone give me advice on where to look for a problem on the right channel of the amplifier? Can these capacitors cause the KC507 transistor to burn out?
Any help or advice would be great.
The right channel does not work on the amplifier (output transistor KD602 is defective). KC507 is also defective.
In the diagram you can see the voltages I measured before replacing the listed transistors.
Since I don't have a KD602 at the moment, I switched the correct transistor from the left channel and I replaced the KC507 with a BC547C transistor. It was supposed to be just a temporary solution and for testing purposes until I get the original transistor. When I turned on the amplifier to test it the transistor and resistor R27 smoked.
I tested all the transistors and diodes on the right channel later and they are all correct. Resistors R44 and R43 are correct. C23 instead of 500µF measures 1150µF (ESR = 0.56 Ohm) and C22 has trouble measuring. Out of 10 measurements, maybe 2 times he manages to get the value. The rest is reported by the damage part. When it manages to measure C22 = 55µF and the ESR is 2.5 Ohms.
Can anyone give me advice on where to look for a problem on the right channel of the amplifier? Can these capacitors cause the KC507 transistor to burn out?
Any help or advice would be great.
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