another NAD 304 whit the red light on...

[al37perez]

Hi, today I turn on my NAD 304...the power light is in red, and the soft cliping in yellow. Nothing about green colour.
I have reading post, and i cannot see were are the r333 and r334 resistors.
Beside, I have the schematics from internet, but it is poor quality scanned.
I´m not have idea about to repair, but my brother is very good with videoconsoles, and he knows electricity...but nothing about english.
I would aprecciate help to me...NAD sound very well for me, and I dont have enough money to buy a new amplifier.
I will expecting your help with opened arms....thank you in advance.

[sakis]

e mail me if you need the schematic ( very clean ) ... i will be sorry to say though that i have no expirience with this model of nad ...i Also dont like NAd any way

regards sakis

[jaycee]

Hifi Engine has a pretty good copy of the service manual. Sign up is free.
NAD 304 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

The tricky thing with this amp is that it is a class H amp with two power supplies that are switched according to the output signal.

Even if he knows no English, if he is good with electronics he should be able to read the schematics. The language of electronics is fairly universal This does however look like a complex amp to service, and I would really recommend someone with some experience.

[sakis]

Originally Posted by jaycee

Hifi Engine has a pretty good copy of the service manual. Sign up is free.
NAD 304 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

The tricky thing with this amp is that it is a class H amp with two power supplies that are switched according to the output signal.

Even if he knows no English, if he is good with electronics he should be able to read the schematics. The language of electronics is fairly universal This does however look like a complex amp to service, and I would really recommend someone with some experience.

just took a look at the schematic after reading your post regarding class H ....god jay cee you are right .... i wonder what NAd people had in mind ..... Mad probabaly not nad ha ha ha ha ha

[jaycee]

Yeah it seems odd to me. It seems to be an effort to allow high power peaks but keep the heatsink/case in proportion for a 30W amp. Seems over-complex to me.

[al37perez]

Well, I have made something. First, thans i have the schematics.
The light is still always in red. But I have used the headpones jack.
When I used the balance, is clearly a poor sound in the right channel, fading off when I move the balance to the right. Left channel appears to sound well.
Is this a clue for resolving the failure?
Has anybody knows where are resistors 333 and 334?
Thank you very much.