Nad 304

ruaneg · 10th September 2006, 03:43 PM

Hi,

.. any help would be appreciated. My brothers NAd 304 has died unfortunately and wont power up. All the fuses seems OK. Could it be the transformer?

Should I just dump it or is there any parts worth salvaging?

Found a schematic..

..its a bit beyond my knowledge!

cheers
gary

mrshow4u · 10th September 2006, 03:58 PM

I couldn't download from the link.

It could be the transformer, but it might be repairable. It could be a thermal cut-out (fuse) tucked inside of the transformer.

B Cullingford · 10th September 2006, 06:04 PM

It could be, but it is silly to guess. I cannot seem to download the schematic, but that does not really change my advice.

No power - you have already done the obvious and checked fuses, what I would do next is to check voltages. Do you have a voltmeter? You should be able to check for AC line voltage coming in on the power cord, then before and after any fuse, then after the power switch (I'm assuming it has a mechanical power switch) then going into the power transformer. Then look for AC of lower voltage coming out of the transformer. Get the idea? Find where you lose power, you don't have to do it in this order - often physical layout makes it easier to do some measurements, do those first - if you have AC voltage coming out of the transformer for example everything before it must be (well probably is) fine and so does not need checking. Then continue to the rectifier diodes and ...

If this does not make any sense then perhaps you should get some help in person, since this involves measureing potentially dangerous voltages.

And yes it could be a thermal fuse in the transformer - if it is there should voltage on the primary windings and not on the secondaries. Isolate the problem area first and then figure out what is wrong, oh and be thankful it is not an intermittent problem.

Anything worth saving? - well that depends on whether you have a use for it, potentially yes of course, I have several carcasses that mostly seem to just take up space - but they do have potentially useful parts!

Bill

ruaneg · 14th September 2006, 07:01 AM

cheers for the advice...ill get my multimeter out..

10th September 2006, 03:43 PM	#1
ruaneg diyAudio Member Join Date: May 2006	Nad 304 Hi, .. any help would be appreciated. My brothers NAd 304 has died unfortunately and wont power up. All the fuses seems OK. Could it be the transformer? Should I just dump it or is there any parts worth salvaging? Found a schematic.. ..its a bit beyond my knowledge! cheers gary

10th September 2006, 03:58 PM	#2
mrshow4u diyAudio Member Join Date: Jul 2006	I couldn't download from the link. It could be the transformer, but it might be repairable. It could be a thermal cut-out (fuse) tucked inside of the transformer. __________________ ".........These go to eleven"

10th September 2006, 06:04 PM	#3
B Cullingford diyAudio Member Join Date: Mar 2005 Location: California	Could it be the transformer? It could be, but it is silly to guess. I cannot seem to download the schematic, but that does not really change my advice. No power - you have already done the obvious and checked fuses, what I would do next is to check voltages. Do you have a voltmeter? You should be able to check for AC line voltage coming in on the power cord, then before and after any fuse, then after the power switch (I'm assuming it has a mechanical power switch) then going into the power transformer. Then look for AC of lower voltage coming out of the transformer. Get the idea? Find where you lose power, you don't have to do it in this order - often physical layout makes it easier to do some measurements, do those first - if you have AC voltage coming out of the transformer for example everything before it must be (well probably is) fine and so does not need checking. Then continue to the rectifier diodes and ... If this does not make any sense then perhaps you should get some help in person, since this involves measureing potentially dangerous voltages. And yes it could be a thermal fuse in the transformer - if it is there should voltage on the primary windings and not on the secondaries. Isolate the problem area first and then figure out what is wrong, oh and be thankful it is not an intermittent problem. Anything worth saving? - well that depends on whether you have a use for it, potentially yes of course, I have several carcasses that mostly seem to just take up space - but they do have potentially useful parts! Bill

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14th September 2006, 07:01 AM	#4
ruaneg diyAudio Member Join Date: May 2006	cheers for the advice...ill get my multimeter out..

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