Disimproved NAD 304 - diyAudio
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Old 29th November 2009, 09:22 PM   #1
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Default 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.
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Old 30th November 2009, 04:43 AM   #2
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Location: Copenhagen, Denmark
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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, Spare time company (just for fun): www.dupont-audio.com
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Old 30th November 2009, 10:04 AM   #3
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Thanks for the quick reply. I'll give it a try post the results.
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Old 30th November 2009, 11:01 PM   #4
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Location: Nova Scotia
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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