Amp burns fuses
I just found a Nad 3020e. It works but it distorts the sound in both channels. At first sight nothing is burned but two fuses (the 4A ones: end stage?). I tried to replace them but when I turned on the two fuses were burned again. What could be causing this? Output transistors?
(this "google translate" sounds horribly but it make life easier 😛 )
I just found a Nad 3020e. It works but it distorts the sound in both channels. At first sight nothing is burned but two fuses (the 4A ones: end stage?). I tried to replace them but when I turned on the two fuses were burned again. What could be causing this? Output transistors?
(this "google translate" sounds horribly but it make life easier 😛 )
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You should get away with just checking them with a meter on low ohms in circuit.
They will be aroudn zero ohms if blown.
Oh... sorry but I really need some basic directions 😕
Can you tell me what I have to do as if I had 6 years?
Can you tell me what I have to do as if I had 6 years?
Put the meter on a low ohms range and test between the 3 pins of the transistor for a short. Do this with all the transistors. If you get around zero ohms then the transistor is shot.
Even if you find one or more transistors faulty this might not be the cause of the fault.
The fault could be in the driver part of the amplifier.
Or, it could be the amp got fried by simply over driving it or by driving too low ohm speakers, in which case replacing the output transistors might fix it.
Either way the output transistor bias will need redoing or you could simply blow up the new transistors.
Even if you find one or more transistors faulty this might not be the cause of the fault.
The fault could be in the driver part of the amplifier.
Or, it could be the amp got fried by simply over driving it or by driving too low ohm speakers, in which case replacing the output transistors might fix it.
Either way the output transistor bias will need redoing or you could simply blow up the new transistors.
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