hi my name is sephy peretz . i live in israel.
i am asking your help, since i saw the forum (diyaudio) and i am happy to meet people in the field of audio, rich with knowledge, gladly willing to dispend help !
i am an electronics technitian.
i am looking for a service manual for my NAD 412 tuner. the transformer blew up a few days ago. primary winding is out. nad sales and representatives practically laughed in my face for asking thier technical help on this matter.
i am desperatly looking for the service manual. willing to pay for it, trade for it or anything else for that matter .
i would appriciate any help on this matter . even directing me to someone else that can help (if noone is able to help ...)
i am asking your help, since i saw the forum (diyaudio) and i am happy to meet people in the field of audio, rich with knowledge, gladly willing to dispend help !
i am an electronics technitian.
i am looking for a service manual for my NAD 412 tuner. the transformer blew up a few days ago. primary winding is out. nad sales and representatives practically laughed in my face for asking thier technical help on this matter.
i am desperatly looking for the service manual. willing to pay for it, trade for it or anything else for that matter .
i would appriciate any help on this matter . even directing me to someone else that can help (if noone is able to help ...)
transformer thermal fuse
Look in the windings of the primary. There may be an open thermal fuse that you can short and take measurements. Don't run the unit like that and consider it fixed, please.
-Chris
Look in the windings of the primary. There may be an open thermal fuse that you can short and take measurements. Don't run the unit like that and consider it fixed, please.
-Chris
hello again ...
thank you .
unfourtunatly there are no thermal fuses in this transformer .
i know what you are talking about since i have seen those many times before on other appliances and on this one there simply isnt any.
i really need to rewire this traffo somehow and have no idea what the input voltages are .
do you happen to know by any chance where can i get service manuals for this device ?
again thank you .
yours sephy .
thank you .
unfourtunatly there are no thermal fuses in this transformer .
i know what you are talking about since i have seen those many times before on other appliances and on this one there simply isnt any.
i really need to rewire this traffo somehow and have no idea what the input voltages are .
do you happen to know by any chance where can i get service manuals for this device ?
again thank you .
yours sephy .
Hi sephy,
I wish I had a diagram for you. Anyone?
How many secondary windings do you have? What is the voltage rating of the main filter capacitor(s)?
I'm hoping you don't have a filament winding for a flouresent display tube. They can range from 2 ish volts to 5 or more volts. In the dark, the filamentshould glow dull red.
-Chris
I wish I had a diagram for you. Anyone?
How many secondary windings do you have? What is the voltage rating of the main filter capacitor(s)?
I'm hoping you don't have a filament winding for a flouresent display tube. They can range from 2 ish volts to 5 or more volts. In the dark, the filamentshould glow dull red.
-Chris
Hi Mate.
I don't have a manual, but I do have a NAD 412, so I will do some measuring tonight for you. 😉
I don't have a manual, but I do have a NAD 412, so I will do some measuring tonight for you. 😉
Right on!
Hey pinkmouse,
That may be better than the schematic. What display does this unit use?
-Chris
Hey pinkmouse,
That may be better than the schematic. What display does this unit use?
-Chris
I didn't get chance to measure last night, I went out instead... 
😉
I will get round to it some time this week though, promise!
The display is a standard LCD segment device, backlit by small linear filament lamps that seem to have a very short life, so I replaced mine the second time around with ultra bright wide angle green LEDs. If I remember correctly the supply for these was 12v ac.
😉I will get round to it some time this week though, promise!
The display is a standard LCD segment device, backlit by small linear filament lamps that seem to have a very short life, so I replaced mine the second time around with ultra bright wide angle green LEDs. If I remember correctly the supply for these was 12v ac.
Thank you.
pinkmouse. thank you!
when ever you get the time if at all possible i would love to know what output voltages the reciever has.
i have had i coule of rough days (work) so i couldnt reply quickly. but now im here 🙂 .
pinkmouse. thank you!
when ever you get the time if at all possible i would love to know what output voltages the reciever has.
i have had i coule of rough days (work) so i couldnt reply quickly. but now im here 🙂 .
Sephy
I measured my NAD 412 last night, and got 19.7-0-19.7 across the secondaries, so I would imagine that a 20-0-20 should do you fine.
Good luck with the repair, and if I can help again just ask, ( though I am only around at weekends at the moment).
I measured my NAD 412 last night, and got 19.7-0-19.7 across the secondaries, so I would imagine that a 20-0-20 should do you fine.
Good luck with the repair, and if I can help again just ask, ( though I am only around at weekends at the moment).
huge huge thanks !
thank you so much pinkmouse.
this sure did the trick !
i rewound the traffo (now that i knew the voltages) and it works 🙂 .
it wasnt that ,easy as the original windings had a 110 and 220 input taps, so it had two diffrent wire widths...
but the important thing is , that now ot works !
i want to thank you guys ,
and thanks again pinkmouse .
sephy.
thank you so much pinkmouse.
this sure did the trick !
i rewound the traffo (now that i knew the voltages) and it works 🙂 .
it wasnt that ,easy as the original windings had a 110 and 220 input taps, so it had two diffrent wire widths...
but the important thing is , that now ot works !
i want to thank you guys ,
and thanks again pinkmouse .
sephy.
Well done mate!
However, I don't think it was your transformer, as my NAD died just after taking those measurements. I suspect we may have an airborn disease, racing around the globe, that only affects tuners! 😉
However, I don't think it was your transformer, as my NAD died just after taking those measurements. I suspect we may have an airborn disease, racing around the globe, that only affects tuners! 😉
died huh ...
well it can be 🙂
sorry to hear that . tell me if i can help in any way fasion or form. ill be glad to.
at least you know the voltages 🙁 ....
primary winding or secondary ?
thanks again .
sephy.
well it can be 🙂
sorry to hear that . tell me if i can help in any way fasion or form. ill be glad to.
at least you know the voltages 🙁 ....
primary winding or secondary ?
thanks again .
sephy.
pinkmouse said:
I also own a NAD 412, and i think the transformer sounds like a bumblebee. i want to change it into a torodial core type. as quiet as possible. i don't know very much about components. can you help me?
Can I change it to this type: http://www.elfa.se/pdf/56/05613278.pdf
It's 2*18V, 2*10VA, and it seems like its 2*22,6V when it's on idle.
It's rated for 2*630mA fuses, but in the NAD 412 the fuses are 315mA. I don't want to mess it up, should I keep the fuses? and should I also mount a DC filter to keep it quiet?
all comments are welcome
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