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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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2. if it has the speaker switch(A, B, A+B) try toggling it, might also just loose contacts.
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Definitive Technology Mythos STS SuperTower loudspeaker are a good match for a NAD M3 integrated amplifier?


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1 Answer

I am trying to hook up my home theater system


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.

Also, depending on the digital output to input configuration, you could possible find a converter online.

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We should be just dealing with audio here, so connect the NAD audio output to CD or DVD IN. Select CD or DVD IN on 2100ES input switch and switch output to AUX OUT (whatever you decided goes to the power amp) on the 2100ES. Turn power amp to AUX IN and it will now get an audio signal from the 2100ES for amplification.
Speakers connect to the power amp as a normal amp, so pos and neg etc. The 2100ES now only acts as a signal feed, the power amp does all the work.

So, summary - switch on the NAD, press play - video goes separately and audio goes to the 2100ES. Turn 2100ES to INPUT for NAD. Turn 2100ES to OUTPUT allocated for power amp. Turn INPUT on power amp to allocation for 2100ES.

Turn it up!

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1 Answer

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1st Try to push (ON) A/B speaker Selector terminal. 2nd try to reset the speaker relay by put the volume on 15% and short-cicuit the speaker terminal for just 1 sec. with the power ON. Good luck

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