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Old 3rd December 2006, 10:17 PM   #1
nlinus is offline nlinus  Sweden
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Default 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?
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Old 3rd December 2006, 10:35 PM   #2
v-bro is offline v-bro  Netherlands
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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....
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Old 13th January 2007, 12:24 PM   #3
nlinus is offline nlinus  Sweden
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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...
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Old 13th January 2007, 04:05 PM   #4
v-bro is offline v-bro  Netherlands
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Well, with all pre/integrated amps every source goes to the rec-outputs. Just the same the rec-outputs go to every source?
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Old 16th January 2007, 07:06 PM   #5
nlinus is offline nlinus  Sweden
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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..
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Old 16th January 2007, 07:06 PM   #6
nlinus is offline nlinus  Sweden
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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?
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Old 17th January 2007, 12:42 AM   #7
v-bro is offline v-bro  Netherlands
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Maybe you can measure it with an ohms meter?
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Old 17th January 2007, 01:18 AM   #8
anatech is offline anatech  Canada
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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
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Old 17th January 2007, 01:02 PM   #9
nlinus is offline nlinus  Sweden
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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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Old 17th January 2007, 01:19 PM   #10
AndrewT is online now AndrewT  Scotland
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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!
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