NAD 304 integrated amp one channel fading problem - Page 3 - diyAudio
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Old 5th February 2009, 03:34 PM   #21
SAUDADE is offline SAUDADE  France
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Merci pour ces mots en français.
N'oublions pas que que le Canada est aussi peuplé de personnes qui partagent cette langue avec nous et je les salue.

English translation:
Thank you for these few words in french.
Some Canadians share this language with us and I'm happy to say a big hello to them.
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Old 26th February 2009, 07:35 PM   #22
kbook is offline kbook  United States
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I ordered the Omron relay and resistors. I will give it a shot. However, when I turn the balance pot to left I can hear sound from the right channel. Do you think it is related to the relay? I looks at the balance pot, it has 4 pin which ALPS doesn't carry this type of pot anymore. Based on the PCB, it seems like 2 pins are connected to the ground. Do you guy ever have this problem before?
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Old 26th February 2009, 07:50 PM   #23
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Hi Kbook

Just clean the pot!

Good luck
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Old 20th July 2009, 01:05 PM   #24
kbook is offline kbook  United States
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Quote:
Originally posted by SAUDADE
Hello every one,
Hello Highspeed,

I'm sorry for coming back on this relay subject.

This relay JW2SN-DC24V you recommend isn't that easy to get, except if you're a professional. I've been on sites selling electronics for amateurs and can't find the exact matching specifications in other models.

Here are thes specs for the

Panasonic JW2SN-DC24V you recommend

Technical/Catalog Information: JW2SN-DC24V
Vendor: Panasonic Electric Works
Category: Relays
Relay Type: General Purpose
Mounting Type: Through Hole
Termination Style: PC Pin
Circuit: DPDT (2 Form C)
Contact Rating @ Voltage: 5A @ 250VAC
Coil Voltage: 24VDC
Control Off Voltage (Min): 2.4 VDC
Control On Voltage (Max): 16.8 VDC
Coil Current: 22mA
Coil Type: Standard
Lead Free Status: Lead Free
RoHS Status: RoHS Compliant
Other Names: JW2SN DC24V
JW2SNDC24V
255 1118 ND
2551118ND
255-1118


Just to confirm. This is where I bought the relay.

http://www.mouser.com/Search/Product...9-JW2ASN-DC24V

This relay works like a charm. I just had time to replace the relay and it fixed my problem totally.

** I think somebody mention about servicing the old relay. I saw that I can take a cover off the old one. It was not sealed.

For person who wants to change the volume potentiometer, I realized the height of the legs are taller than the regular pot so I have to find the way to extend the legs. others have the same height (Balance, Bass, Treble)

I did changed the Balance Potentiometer also. From the diagram the 4th leg link to the ground so I can use the regular 3-leg 10K linear pot and it solved another problem.

What a happy ending except for the Volume pot. Cheers! and Thanks you guys for information.

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Old 24th September 2009, 01:45 AM   #25
DCC is offline DCC  Antarctica
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Default NAD 304 power cut out

Guys,

I made use of this great information to fix my much used NAD 304 earlier this year. I replaced the relay with a new Finder unit.

Now, have just moved house (I still have the original box and was very careful) and have run into another issue....

When I turn on my amp, the green light comes on after a few moments, together with the click of the relay. However after a few minutes the power just cuts out and never comes back on. If I turn off and come back an hour later, then the same problem occurs.

Any ideas?
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Old 13th November 2009, 02:48 PM   #26
kbook is offline kbook  United States
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I would check voltage output from the transformer and see if the transformer lost the output ? I am not a pro but that is the first thing that I will check, then the diode bridge. I have to look at the diagram a bit.
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Old 17th November 2009, 06:14 AM   #27
DCC is offline DCC  Antarctica
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Hi kbook, thanks for your comment, I checked the transformer a few days ago and it is still giving output. I did not look at the diode bridge, I will have a look at it, though I'm not sure how a diode bridge works. I was wondering about the thermal switches mounted on the heat sink, maybe one has drifted and switches off the output.
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Old 19th November 2009, 02:57 PM   #28
kbook is offline kbook  United States
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Quote:
Originally Posted by DCC View Post
Hi kbook, thanks for your comment, I checked the transformer a few days ago and it is still giving output. I did not look at the diode bridge, I will have a look at it, though I'm not sure how a diode bridge works. I was wondering about the thermal switches mounted on the heat sink, maybe one has drifted and switches off the output.
Do you have the service manual? so you can go thru the maintenance procedures like checking the bias.

Click the image to open in full size.

The diode bridge's job is to convert AC to DC. Bridge came from how the diodes are connected. Basically, it uses 4 rectifier diodes but diode bridge does have in a package already so it has 4 legs with + and - for DC output and the two ~ for AC input.

Good luck.
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Last edited by kbook; 19th November 2009 at 03:01 PM. Reason: Add picture
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Old 19th November 2009, 03:20 PM   #29
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Have your checked R333, R334 (47k) and R917, R918 (180 ohm)?

Those resistors run hot and if (when!) they go open the amplifier stops working and the DC protection usually cuts out. You should replace them with higher rated types if you have not already done so.
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Old 19th November 2009, 03:24 PM   #30
SAUDADE is offline SAUDADE  France
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The 304 has a TOSHIBA TA317P PROTECTION CIRCUIT FOR OCL POWER AMPLIFIER AND SPEAKER (IC701 on the schematics). It protects your amp when overloaded by shutting it off. You must find out why your amp is overloaded. The TA317P might also have a problem.
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