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Old 6th July 2004, 01:27 PM   #1
liquias is offline liquias  Israel
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Default Nad 412

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 ...)
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Old 6th July 2004, 11:39 PM   #2
anatech is offline anatech  Canada
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Default 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
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Old 7th July 2004, 07:29 AM   #3
liquias is offline liquias  Israel
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Default 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 .
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Old 8th July 2004, 02:57 AM   #4
anatech is offline anatech  Canada
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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
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Old 10th July 2004, 02:33 PM   #5
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Hi Mate.

I don't have a manual, but I do have a NAD 412, so I will do some measuring tonight for you.
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Old 10th July 2004, 03:48 PM   #6
anatech is offline anatech  Canada
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Thumbs up Right on!

Hey pinkmouse,
That may be better than the schematic. What display does this unit use?
-Chris
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Old 11th July 2004, 10:39 AM   #7
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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.
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Old 13th July 2004, 06:11 AM   #8
liquias is offline liquias  Israel
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Default 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 .
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Old 18th July 2004, 07:21 AM   #9
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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).
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Old 25th July 2004, 07:03 AM   #10
liquias is offline liquias  Israel
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Talking 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.
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