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Nad 310 blows fuse in left channel at turn on.

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  • Anonymous Mar 13, 2014

    When the unit is left turned off for more than 4 hours every channel pre set is lost.

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Hi, Unfortunately, this means that the output transistors on the left channel have blown. I've rebuilt a couple 310s, and I own one myself, so this isn't the first time I've seen it. The chassis doesn't ventilate the left channel as well as it does the right, so it tends to die sooner.
If you can do this yourself, it will not be terribly expensive, but the main output transistor is a MOSFET, which means you'll have to be very careful about static, and you'll have to find a substitute for it as well, as it is no longer available.
I strongly recommend replacing the small electrolytic caps in the amp too. By now heat and age will have taken their toll on them. In my 310, replacing them wasn't an option to get it to behave well.

Posted on Sep 16, 2008

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2 Answers

Hi ihave nad 304 it keeps blowing 5 amp fuses


Most likely caused by a shorted output transistors on at least one channel + possibly some other components they took with them... but maybe you are lucky and you have a shorted power capacitor or something.

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The left main channel not working. hook any speaker to it and putting my ear close, it has a very low hollow sound, almost a hum. would there be fuses, a reset, or something on each channel or something...


There is no seperate fuse but it seems likely that the left side preamp or the power amp section had opened up a fusible resisitor that could have shut the section.
Now the only way out is to take a voltage or signal test with the right - working- channel as a reference . Please attempt only if you are familiar if not it will end up with further damage as the sections are very delicate. Testing with a signal will confirm the faulty section to narrow down your search.

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You need to look inside. There will be a fuse inside too. If your lucky it will restore the amp once replaced, but if it blows again you have a fault. You can track it down yourself if your any good, you might even see a burnt out part when looking for that fuse, otherwise get the repairman in.

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The output should be 24v ac. Sounds like you have a busted transformer. Did you check out the resistor in front of the transformer.

You sound like you know what your talking about so I will not bore you with suff like glass fuses and thermal couples.

Good luck, I have had a few items like this over the years. Sometimes it's just best to send them in to the manufacture. I would look for a replacement transformer. 120v ac to 24v ac around 5 amps. Test it out and see if it works... If not, send it in.

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If swapping of left and right input sources and left and right speakers does not help...you might have a bad channel in your amp.

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Only the right channel had a sound,the left channel is mute, whatever adjustment you did and whatever balancing you done nothigs happen,even you interchange the speakers. The problem is in the power amp. The STK IC there is busted already, it's better to change it with a new one so the performance become normal again.

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Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.

80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also

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