Disimproved NAD 304

auriculares · 29th November 2009, 09:22 PM

My old NAD 304 used to have the famous channel fading problem. So tried to replace the R 334 as recommended in many threads. But instead of using a 47k resistor, I accidently used a 47r resistor... Well, that's a factor of 1000. Since then, the red LED does no switch to green anymore. I replaced the resistor and put in a proper one, but the problem persists. So I think I burnt some other components. As I am rather new to electronics, I would be really grateful for any advice on where to start looking.

Jan Dupont · 30th November 2009, 04:43 AM

Check Zeners D306 and D308 (I think that's the numbers as the copy of the service manual I have i rathter poor quality). There should be 3.9V across each.
My copy of the manual can be found here:
Welcome to Audio Circuit Denmark

auriculares · 30th November 2009, 10:04 AM

Thanks for the quick reply. I'll give it a try post the results.

CrazzyAbtTubes · 30th November 2009, 11:01 PM

While you are at it, you should check for bad solder joints, they are almost always the cause of intermittent problems.

29th November 2009, 09:22 PM	#1
auriculares diyAudio Member Join Date: Nov 2009	Disimproved NAD 304 My old NAD 304 used to have the famous channel fading problem. So tried to replace the R 334 as recommended in many threads. But instead of using a 47k resistor, I accidently used a 47r resistor... Well, that's a factor of 1000. Since then, the red LED does no switch to green anymore. I replaced the resistor and put in a proper one, but the problem persists. So I think I burnt some other components. As I am rather new to electronics, I would be really grateful for any advice on where to start looking.

30th November 2009, 04:43 AM	#2
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Check Zeners D306 and D308 (I think that's the numbers as the copy of the service manual I have i rathter poor quality). There should be 3.9V across each. My copy of the manual can be found here: Welcome to Audio Circuit Denmark __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

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30th November 2009, 10:04 AM	#3
auriculares diyAudio Member Join Date: Nov 2009	Thanks for the quick reply. I'll give it a try post the results.

30th November 2009, 11:01 PM	#4
CrazzyAbtTubes diyAudio Member Join Date: May 2009	While you are at it, you should check for bad solder joints, they are almost always the cause of intermittent problems.

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