Home |
Search |
Today's Posts |
#1
Posted to rec.audio.tech
|
|||
|
|||
problem with NAD 716 speakers cutting out
Recently purchased a used NAD AV-716 receiver (I know I took a risk
buying a 90s receiver and having it shipped, but am prepared to pay for repairs). Sometimes one channel or the other of the mains cuts out (the headphones don't), but when the volume is turned up it comes back on. I checked the speaker connections and they're OK. Something going south? |
#2
Posted to rec.audio.tech
|
|||
|
|||
problem with NAD 716 speakers cutting out
"sillyputty" wrote in message
Recently purchased a used NAD AV-716 receiver (I know I took a risk buying a 90s receiver and having it shipped, but am prepared to pay for repairs). Sometimes one channel or the other of the mains cuts out (the headphones don't), but when the volume is turned up it comes back on. I checked the speaker connections and they're OK. Something going south? There's a bad connection, someplace. An insulating oxide layer is forming, and then the loud music punches a hole in it, and the sound comes back for a while. Bad solder joint? |
#3
Posted to rec.audio.tech
|
|||
|
|||
problem with NAD 716 speakers cutting out
sillyputty wrote:
Recently purchased a used NAD AV-716 receiver (I know I took a risk buying a 90s receiver and having it shipped, but am prepared to pay for repairs). Sometimes one channel or the other of the mains cuts out (the headphones don't), but when the volume is turned up it comes back on. I checked the speaker connections and they're OK. Something going south? Hello, While I'll agree with Arne that there could be a bad solder joint somewhere (look at power supply voltage regulators and the driver IC's for the amps.), you could also have bad speaker relays, or noisy pots. (Treble, bass, balance or maybe volume controls.) If you take this receiver to a repair shop, have them replace R921, R 922 and R923 (all 0.47 ohm ) and R924 (33 ohm) resistors with half watt, flameproof type, if they have not been replaced already. They are on the near the front edge of the main board. The original ones are 1/4 watt and are subject to open for no reason. This is a common problem in the NAD AV716, but is NOT what is causing your current problem. Regards, Tim Schwartz Bristol Electronics |
#4
Posted to rec.audio.tech
|
|||
|
|||
problem with NAD 716 speakers cutting out
"sillyputty" wrote in message ... Recently purchased a used NAD AV-716 receiver (I know I took a risk buying a 90s receiver and having it shipped, but am prepared to pay for repairs). Sometimes one channel or the other of the mains cuts out (the headphones don't), but when the volume is turned up it comes back on. I checked the speaker connections and they're OK. Something going south? If the headphone doesn't cut out, it's gotta' be the speaker protection relay. Everything else is common between the headphone jack and speaker jacks. This is a common ailment with older equipment. You'll have to either replace the relay(s) or remove them from the board, open them up (sometimes you can, sometimes you can't) and clean the contacts with a fine emery board. I use a points file, used to clean the contacts between the points before electronic ignition was common in cars... it's just the right size for that sort of work. The relays themselves shouldn't be expensive and they're very simple to replace if you've got rudiementary skill with a soldering iron. Dave |
#5
Posted to rec.audio.tech
|
|||
|
|||
problem with NAD 716 speakers cutting out
Dave said:
If the headphone doesn't cut out, it's gotta' be the speaker protection relay. I have a similar problem with a Denon receiver, ie one channel down in volume reference the other cured by a tweak of the volume control, I noticed that it only occured if I switched on with no signal input or with volume control set very low. I get round it now by setting input to tuner with highish volume when I switch on and have no problems for that session. Give it a try. -- Ken Contribute to: www.audiophilewiki.org |
#6
Posted to rec.audio.tech
|
|||
|
|||
problem with NAD 716 speakers cutting out
"UnsteadyKen" wrote in message m... Dave said: If the headphone doesn't cut out, it's gotta' be the speaker protection relay. I have a similar problem with a Denon receiver, ie one channel down in volume reference the other cured by a tweak of the volume control, I noticed that it only occured if I switched on with no signal input or with volume control set very low. I get round it now by setting input to tuner with highish volume when I switch on and have no problems for that session. Give it a try. -- Yes the relay contacts get oxidized. A strong signal is able to arc through the oxidation and get a connection established, but the oxidation acts as a weak insulator. |
#7
Posted to rec.audio.tech
|
|||
|
|||
problem with NAD 716 speakers cutting out
Dave said:
Yes the relay contacts get oxidized. A strong signal is able to arc through the oxidation and get a connection established, but the oxidation acts as a weak insulator. Thanks for the info, I thought that this was what was causing the problem. I might have a go at cleaning up the contacts as someone suggested, but from what I remember when I last had the lid off, they appear to be sealed units. It's livable with. -- Ken |
Reply |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
speakers problem | Audio Opinions | |||
Crackling/popping coming from speakers, cutting out at higher volume | Car Audio | |||
Distortion and cutting out from speakers | Tech | |||
speakers problem | Tech | |||
Front speakers cutting out. | Car Audio |