Nad c340 input selector

nlinus · 3rd December 2006, 09:17 PM

I'm having problems with the input selector. I seems like all the inputs are active at the same time, so the signals get mixed and distorted.

Does anyone know if it's a common problem in these models? What should I check out first?
Does anyone have a schematic for this amplifier?

v-bro · 3rd December 2006, 09:35 PM

Have you tried to connect only one input source? I've once solved a similar problem with someone who connected an analogue rec/play in/output the wrong way around....

nlinus · 13th January 2007, 11:24 AM

No, I haven't tried that.

I Have heard of at least to more owners of these amplifiers with the same problem. They got it fixed, but had to pay 1400 SEK (about 200 USD) for it. Not really worth it...

v-bro · 13th January 2007, 03:05 PM

Well, with all pre/integrated amps every source goes to the rec-outputs. Just the same the rec-outputs go to every source?

nlinus · 16th January 2007, 06:06 PM

Can someone who knows point out on this pic where the actual input switching is? I was looking for some relays or something but can't se them..

nlinus · 16th January 2007, 06:06 PM

At a closer look i seems like it's the Toshiba TC9273N that makes the shifting between inputs.

Is it possible that this component may have broke in such way that all the inputs are activates at the same time?

v-bro · 16th January 2007, 11:42 PM

Maybe you can measure it with an ohms meter?

anatech · 17th January 2007, 12:18 AM

Hi nlinus,

Quote:

At a closer look i seems like it's the Toshiba TC9273N that makes the shifting between inputs.

Yup.

Quote:

Is it possible that this component may have broke in such way that all the inputs are activates at the same time?

Yup. Also check all your ground traces to make sure it didn't blow open, possibly destroying the chip at the same time.

Quote:

Maybe you can measure it with an ohms meter?

Hi vbro,
Nope. Don't do it.

-Chris

nlinus · 17th January 2007, 12:02 PM

Does anyone know where I can buy the TC9273N-010?
I have googled for about two hours, but can't find anything but dealers that sells quantities like 1000items and more.

Is there a big difference between the models? I have found -007, -008, -009, -009... ...

AndrewT · 17th January 2007, 12:19 PM

Hi,
a solid state input selector!

Is it worth saving/resurrecting?

What about inserting a real switch selector and hard wiring the switch output into the PCB after that Tosh chip? (That is deliberately derogatory!)

Or

making up a relay switching selector PCB?
There's sufficient room in there for many projects!

3rd December 2006, 09:17 PM	#1
nlinus diyAudio Member Join Date: Jan 2004 Location: Jämtland	Nad c340 input selector I'm having problems with the input selector. I seems like all the inputs are active at the same time, so the signals get mixed and distorted. Does anyone know if it's a common problem in these models? What should I check out first? Does anyone have a schematic for this amplifier?

3rd December 2006, 09:35 PM	#2
v-bro diyAudio Member Join Date: May 2006	Have you tried to connect only one input source? I've once solved a similar problem with someone who connected an analogue rec/play in/output the wrong way around.... __________________ Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......

13th January 2007, 03:05 PM	#4
v-bro diyAudio Member Join Date: May 2006	Well, with all pre/integrated amps every source goes to the rec-outputs. Just the same the rec-outputs go to every source? __________________ Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......

16th January 2007, 11:42 PM	#7
v-bro diyAudio Member Join Date: May 2006	Maybe you can measure it with an ohms meter? __________________ Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......

17th January 2007, 12:19 PM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, a solid state input selector! Is it worth saving/resurrecting? What about inserting a real switch selector and hard wiring the switch output into the PCB after that Tosh chip? (That is deliberately derogatory!) Or making up a relay switching selector PCB? There's sufficient room in there for many projects! __________________ regards Andrew T.


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13th January 2007, 11:24 AM	#3
nlinus diyAudio Member Join Date: Jan 2004 Location: Jämtland	No, I haven't tried that. I Have heard of at least to more owners of these amplifiers with the same problem. They got it fixed, but had to pay 1400 SEK (about 200 USD) for it. Not really worth it...

16th January 2007, 06:06 PM	#6
nlinus diyAudio Member Join Date: Jan 2004 Location: Jämtland	At a closer look i seems like it's the Toshiba TC9273N that makes the shifting between inputs. Is it possible that this component may have broke in such way that all the inputs are activates at the same time?

17th January 2007, 12:02 PM	#9
nlinus diyAudio Member Join Date: Jan 2004 Location: Jämtland	Does anyone know where I can buy the TC9273N-010? I have googled for about two hours, but can't find anything but dealers that sells quantities like 1000items and more. Is there a big difference between the models? I have found -007, -008, -009, -009... ...

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