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NAD 3130 fuses and/or service manual/schematic

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Last response: in Home Audio
Anonymous
July 19, 2004 12:05:44 AM

Archived from groups: rec.audio.tech (More info?)

i want to repair my amp, but i don't have enough technical
information. 2 fuses blew and i am trying to figure out if the are
slow or fast-blow and what arrangement the fuses actually should be in
on the board. the fuse attachments are marked F1, F2, F3 and F4. all
of the fuses are 4A 250V, but 2 have BUSS AGC on them and the other 2
have 313 on them. the ones that blew are the BUSS AGC.

1. is there a difference between these 2 sets of fuses? (slow/fast)
2. if there is a difference, which fuses should be in which spot?
(F1,F2,F3,F4)
3. is there a service manual/schematic available?
4. could someone make this info available to me?

TIA
PizMD

HUMANS: the animal that killed the planet...

More about : nad 3130 fuses service manual schematic

Anonymous
July 19, 2004 4:08:38 PM

Archived from groups: rec.audio.tech (More info?)

PizMD,

According to the manual, all 4 fuses are slo-blo or 'T' type. F1 and 2
are 1 amp and F3 and 4 are 4 amp. F1 and F2 power the regulated
supplies that feed the preamp and power amp, where as F3 and F4 are the
unregulated fuses for the rail that supply only the power amps.

If a second set of fuses blow then you have another problem. It is not
rare for an older NAD like this to have soldering problems and 'cooked'
small electrolytic capacitors that have dried out, especially near
sources of heat like the power supply regulator transistors.

Regards,
Tim Schwartz
Bristol Electronics


PizMD wrote:
>
> i want to repair my amp, but i don't have enough technical
> information. 2 fuses blew and i am trying to figure out if the are
> slow or fast-blow and what arrangement the fuses actually should be in
> on the board. the fuse attachments are marked F1, F2, F3 and F4. all
> of the fuses are 4A 250V, but 2 have BUSS AGC on them and the other 2
> have 313 on them. the ones that blew are the BUSS AGC.
>
> 1. is there a difference between these 2 sets of fuses? (slow/fast)
> 2. if there is a difference, which fuses should be in which spot?
> (F1,F2,F3,F4)
> 3. is there a service manual/schematic available?
> 4. could someone make this info available to me?
>
> TIA
> PizMD
>
> HUMANS: the animal that killed the planet...
Anonymous
July 20, 2004 2:13:51 AM

Archived from groups: rec.audio.tech (More info?)

Tim,

thanks a mill. based on what you have indicated, are the 1A fuses
250V as well? why would there be 4A fuses in F1 and F2?

the fuses blew because i did something foolish and had my otherwise
wonderful device hooked up to a large PA speaker. i do not know what
rating of the speaker was, but i had no business doing it. it
actually held up quite well under the circumstances. when i put the
amp back in my office/studio, i noticed an obvious degradation in
sound. i decided to fix it myself this time instead of putting out
$85 as i did the last time it went on the blink.

although i have a copy of the original user manual, i did not realize
until researching for this repair that this amp is only rated at 30W.
i have no idea how i missed that important fact. i have done a few
thing with this amp that should have killed it long ago. i have had
it for going on 10 years and it was used when i got it.

anyways, any further assistance you can offer is greatly appreciated.

TIA
On Mon, 19 Jul 2004 12:08:38 GMT, Tim Schwartz
<toschwartz@worldnet.att.net> wrote:

>PizMD,
>
> According to the manual, all 4 fuses are slo-blo or 'T' type. F1 and 2
>are 1 amp and F3 and 4 are 4 amp. F1 and F2 power the regulated
>supplies that feed the preamp and power amp, where as F3 and F4 are the
>unregulated fuses for the rail that supply only the power amps.
>
> If a second set of fuses blow then you have another problem. It is not
>rare for an older NAD like this to have soldering problems and 'cooked'
>small electrolytic capacitors that have dried out, especially near
>sources of heat like the power supply regulator transistors.
>
>Regards,
>Tim Schwartz
>Bristol Electronics
>
>
>PizMD wrote:
>>
>> i want to repair my amp, but i don't have enough technical
>> information. 2 fuses blew and i am trying to figure out if the are
>> slow or fast-blow and what arrangement the fuses actually should be in
>> on the board. the fuse attachments are marked F1, F2, F3 and F4. all
>> of the fuses are 4A 250V, but 2 have BUSS AGC on them and the other 2
>> have 313 on them. the ones that blew are the BUSS AGC.
>>
>> 1. is there a difference between these 2 sets of fuses? (slow/fast)
>> 2. if there is a difference, which fuses should be in which spot?
>> (F1,F2,F3,F4)
>> 3. is there a service manual/schematic available?
>> 4. could someone make this info available to me?
>>
>> TIA
>> PizMD
>>
>> HUMANS: the animal that killed the planet...

PizMD

HUMANS: the animal that killed the planet...
Related resources
Anonymous
July 20, 2004 4:04:12 PM

Archived from groups: rec.audio.tech (More info?)

PizMD,

First, please use a valid e-mail address in you postings.

The info that I gave you about F1 and F2 being 1A fuses is from the
service manual. It is possible that the fuses in you amp were changed
at some point with the wrong fuses. Less likely is that the factory
changed the spec, or an error was made during manufacture.

The voltage rating on fuses is only a rating to stop arcing in the case
of a blown fuse, so it is always safe to use a 250V fuse in place of a
125V fuse, but not the other way around. on the assumption that you
live in a 125V line voltage area, 125V fuses would be fine, as would
250V ones.

Regards,
Tim Schwartz
Bristol Electronics


PizMD wrote:
>
> Tim,
>
> thanks a mill. based on what you have indicated, are the 1A fuses
> 250V as well? why would there be 4A fuses in F1 and F2?
>
> the fuses blew because i did something foolish and had my otherwise
> wonderful device hooked up to a large PA speaker. i do not know what
> rating of the speaker was, but i had no business doing it. it
> actually held up quite well under the circumstances. when i put the
> amp back in my office/studio, i noticed an obvious degradation in
> sound. i decided to fix it myself this time instead of putting out
> $85 as i did the last time it went on the blink.
>
> although i have a copy of the original user manual, i did not realize
> until researching for this repair that this amp is only rated at 30W.
> i have no idea how i missed that important fact. i have done a few
> thing with this amp that should have killed it long ago. i have had
> it for going on 10 years and it was used when i got it.
>
> anyways, any further assistance you can offer is greatly appreciated.
>
> TIA
> On Mon, 19 Jul 2004 12:08:38 GMT, Tim Schwartz
> <toschwartz@worldnet.att.net> wrote:
>
> >PizMD,
> >
> > According to the manual, all 4 fuses are slo-blo or 'T' type. F1 and 2
> >are 1 amp and F3 and 4 are 4 amp. F1 and F2 power the regulated
> >supplies that feed the preamp and power amp, where as F3 and F4 are the
> >unregulated fuses for the rail that supply only the power amps.
> >
> > If a second set of fuses blow then you have another problem. It is not
> >rare for an older NAD like this to have soldering problems and 'cooked'
> >small electrolytic capacitors that have dried out, especially near
> >sources of heat like the power supply regulator transistors.
> >
> >Regards,
> >Tim Schwartz
> >Bristol Electronics
> >
> >
> >PizMD wrote:
> >>
> >> i want to repair my amp, but i don't have enough technical
> >> information. 2 fuses blew and i am trying to figure out if the are
> >> slow or fast-blow and what arrangement the fuses actually should be in
> >> on the board. the fuse attachments are marked F1, F2, F3 and F4. all
> >> of the fuses are 4A 250V, but 2 have BUSS AGC on them and the other 2
> >> have 313 on them. the ones that blew are the BUSS AGC.
> >>
> >> 1. is there a difference between these 2 sets of fuses? (slow/fast)
> >> 2. if there is a difference, which fuses should be in which spot?
> >> (F1,F2,F3,F4)
> >> 3. is there a service manual/schematic available?
> >> 4. could someone make this info available to me?
> >>
> >> TIA
> >> PizMD
> >>
> >> HUMANS: the animal that killed the planet...
>
> PizMD
>
> HUMANS: the animal that killed the planet...
Anonymous
July 21, 2004 4:42:28 AM

Archived from groups: rec.audio.tech (More info?)

Tim,

thanks again. i don't use my real email for privacy/security reasons.
i will email you assuming that your email is a valid one.

now i can make my trip to Radio Shack...


On Tue, 20 Jul 2004 12:04:12 GMT, Tim Schwartz
<toschwartz@worldnet.att.net> wrote:

>PizMD,
>
> First, please use a valid e-mail address in you postings.
>
> The info that I gave you about F1 and F2 being 1A fuses is from the
>service manual. It is possible that the fuses in you amp were changed
>at some point with the wrong fuses. Less likely is that the factory
>changed the spec, or an error was made during manufacture.
>
> The voltage rating on fuses is only a rating to stop arcing in the case
>of a blown fuse, so it is always safe to use a 250V fuse in place of a
>125V fuse, but not the other way around. on the assumption that you
>live in a 125V line voltage area, 125V fuses would be fine, as would
>250V ones.
>
>Regards,
>Tim Schwartz
>Bristol Electronics
>
>
>PizMD wrote:
>>
>> Tim,
>>
>> thanks a mill. based on what you have indicated, are the 1A fuses
>> 250V as well? why would there be 4A fuses in F1 and F2?
>>
>> the fuses blew because i did something foolish and had my otherwise
>> wonderful device hooked up to a large PA speaker. i do not know what
>> rating of the speaker was, but i had no business doing it. it
>> actually held up quite well under the circumstances. when i put the
>> amp back in my office/studio, i noticed an obvious degradation in
>> sound. i decided to fix it myself this time instead of putting out
>> $85 as i did the last time it went on the blink.
>>
>> although i have a copy of the original user manual, i did not realize
>> until researching for this repair that this amp is only rated at 30W.
>> i have no idea how i missed that important fact. i have done a few
>> thing with this amp that should have killed it long ago. i have had
>> it for going on 10 years and it was used when i got it.
>>
>> anyways, any further assistance you can offer is greatly appreciated.
>>
>> TIA
>> On Mon, 19 Jul 2004 12:08:38 GMT, Tim Schwartz
>> <toschwartz@worldnet.att.net> wrote:
>>
>> >PizMD,
>> >
>> > According to the manual, all 4 fuses are slo-blo or 'T' type. F1 and 2
>> >are 1 amp and F3 and 4 are 4 amp. F1 and F2 power the regulated
>> >supplies that feed the preamp and power amp, where as F3 and F4 are the
>> >unregulated fuses for the rail that supply only the power amps.
>> >
>> > If a second set of fuses blow then you have another problem. It is not
>> >rare for an older NAD like this to have soldering problems and 'cooked'
>> >small electrolytic capacitors that have dried out, especially near
>> >sources of heat like the power supply regulator transistors.
>> >
>> >Regards,
>> >Tim Schwartz
>> >Bristol Electronics
>> >
>> >
>> >PizMD wrote:
>> >>
>> >> i want to repair my amp, but i don't have enough technical
>> >> information. 2 fuses blew and i am trying to figure out if the are
>> >> slow or fast-blow and what arrangement the fuses actually should be in
>> >> on the board. the fuse attachments are marked F1, F2, F3 and F4. all
>> >> of the fuses are 4A 250V, but 2 have BUSS AGC on them and the other 2
>> >> have 313 on them. the ones that blew are the BUSS AGC.
>> >>
>> >> 1. is there a difference between these 2 sets of fuses? (slow/fast)
>> >> 2. if there is a difference, which fuses should be in which spot?
>> >> (F1,F2,F3,F4)
>> >> 3. is there a service manual/schematic available?
>> >> 4. could someone make this info available to me?
>> >>
>> >> TIA
>> >> PizMD
>> >>
>> >> HUMANS: the animal that killed the planet...
>>
>> PizMD
>>
>> HUMANS: the animal that killed the planet...

PizMD

HUMANS: the animal that killed the planet...