NAD 304 AMP...No Sound at all on both channels, Black marks on inner case.
I have no sound on both cahnnels, Ive opened up the case and there are black marks on the top of the inner caseing. That doesnt look good at all, but there appears to be know burn damage to the board on the area this occured. Right below these marks on the inner caseing on the board are two glass fuses, they seem to be intacted as well. The amp powers up fine and shows the green indicator light. Simply no sound out the badger!
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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.
Hi there I have a C340 that has similar problem, you must have bought this from ebay, lol.
Nad made a mistake on the C range, the pre - power link can be shorted out. if the pre is shorted out it takes out the pre amplifier stage, I have managed to get the right channel working, I will keep you informed what is the cause of the left channel. I have replaced the pre-amp IC and a couple of Jfets and transistors. Once I have repaired the Amp I could repaire yours if you like???
first of all you can check either amp or pre is defect. for this change wiring left to right and right to left (pre to amp wiring). if still left channel has no sound the problemmaker is the amp. would be helpfull for further assistance if i know the model number.
Because your amp has 4 channels on it on side A you can connect 2 speakers for left and right and the B you can do the same. your red is positive and black is negative. so in total you can have 4 speakers connected to your amp
The first click is the power relay connecting up the main transformer, the second click you normally hear is the speaker protection relay. When a fault condition is present in the amp, the protection circuit prevents the speakers connecting to the amp by NOT operating the relay. As the unit "settles" and works after the delay you noticed, what ever issue the amp is balancing itself it. It sounds like a leaky capacitor in transistor in the output stages. This can often be located with quick bursts of freeze coolant spray. It may also be a dry joint in the soldering about the driver and output transistors, always pays to have a visual look at it whilst you are in there. I also check power regulator stages for dry joints. The fault will be on one channel if it is signal path related, and both channels if power supply related. If you are familiar with electronic repairs, get in and have a look yourself. If not, get a NAD service guy to take a look at it for you. Good luck. Feel free to ask me any questions you may have about it.
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.