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NAD 302 AMP FAULT

My NAD 302 amp cuts out after running for about 1 hour. Switch off leave for a while and it comes back on again. Any ideas please.

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Checa si las bocinas estan bien ,despues checa si no hay componentes recalentados en el si no los hay ,los ICs amplificadores de audio estan a punto de tronar

Posted on Apr 04, 2008

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Disconnect all speakers and switch ON the set without any input connected, and see whether it heats up. A moderate heat is permissable, but should not over heat. If it overheats without any load or input connected, the set need service. OK.

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Hello, I have an idea:
at the rear side of the NAD preamp there is a switch, it can be in mode MM or MC . Please check it whether it is in right position or not.

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Reverse your RCA input around and see if the problem follows, this will determine if the problem is in the turntable output signal or the preampsection of your amp. If it stays on the same channel, slightly move the RCA that's dropping out signal around. If the signal cuts in and out, you know it's just a weak solder joint on the input rca of the amp. If it does not change, your problem is deeper. Chances are it's a "cold solder joint" on the input section of the amp and would only be a labor type repair and no parts involved. That can be a double edged sword as well depending on how long it takes to find it. If you have to have it serviced, find a local shop that's been around a while, they are likely to be a little more insightful as to the exact problem quicker. Hope this helps

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Lets try the simple stuff first. This whole problem could be caused by a dirty switch contact. Pick up some electronics cleaner from a local electronics shop and spray the switch (from the inside of the unit). Work the switch on/off a number of times then respray one more time. That should clean out any dirt that is there. Try the unit again and hopefully the problem is resolved. If not, then the switch itself may need to be replaced. When you get the cleaner, get one that contains a lubricant as well. This will help to prevent the problem from coming back again.

Dan

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Hi, i would try flooding trhe switch with CRC 2-26 for a start. Itr may recover some contact integrity. A jerry rig solution would be to bridge the switch contacts and leave it on all the time(i leave my amps running all the time) or if as in Australia you have a switch on the wall socket use that,


OR purchase a new switch from here. Not sure how you would go through NAD, probably dont have any in stock as a spare these days.

or if that does not work out, I could get one to you through ebay. Used to be quite a common TV switch, but I also remember replacing then in Nad amps, many moons ago ;) I think I still have a one in stock myself, packed away from when I was a NAD service agent:)

regards
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OK,  That means there's some kind of crazy fault in the temperature sensing circuits. I'm afraid you'll have to take it someplace and have it looked at for a more thorough diagnosis.

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sounds to me that the vol control has lost its earth end connection So yes its a problem with the dial control You couls try some contact cleaner But better still lift of the lid and base if possible while the amplifier is not plugged into the power socket and see if you have a dry joints around the vol control pot regards Trev

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