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I have a problem with NAD 3300 moniter series its power output tranisters damaged i replaced one by one . now there is no sound at the colector of Q51 or q 52 and the voltage is also 4v

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Normally the outputs are changed in pairs because the failure of one tends to stress the other enough to make it the next failure. I don't have the service manual so I can't tell what Q51 or Q52 are, but when the outputs go bad (shorted usually), you must also check the driver circuit and the bias transistors. It is very unusual for only the outputs to be bad. Check all of the resistors in the area as well. Low valued ones may be open and since the are often flameproof resistors, there will be no physical indication that they are bad.

Keep us posted.
Dan

Posted on Aug 27, 2008

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Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
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What exactly does it mean if 'everything works' but it has 'no sound output'? As a two channel amp that would be its ONLY function.

The root cause for 'no sound' could be something as simple as a misplaced control (Tape Monitor?) or missing pre-out/main in links. It's in the manual.

Register and download it for free at retrevo.com

http://www.retrevo.com/support/NAD-C350-Amps-manual/id/8043dj589/t/2/

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marvidson,
With the NAD model that you have and its lack of component or HMDI switching, the only way is to connect your system, sort of, backwards.

The only way to do it is to connect your digital cable box and blueray player directly to the tv, then the audio output from the tv to one of the video inputs on the NAD. The NAD has digital coaxial and toslink inputs so if your tv has one of them as an output, that would give you the best sound to the NAD. If your tv does not have either of those outputs, then you will be limited to the composite outputs (red and white) but that will still give you good sound.

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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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Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
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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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