These are electronic switches - but any time I switch from AUX to one of the other inputs, it immediately switches back to AUX. If I hold the button down for one of the other inputs, sound is fine.
Complicating factor: this is a UK C350 that I have been using both in the US with a transformer and overseas. Just back from Europe again, this problem cropped up about 30 mins after reinstalling the amplifier with a transformer that I have used successfully in the past. None of the other 220v units that are running off of this transformer seem to have a problem.
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Re: NAD C350 stuck on "auxiliary" input
I have noticed that this nad c3xx series may have a general problem with the input switching chip. There are more post here on fixya where people have similar problems as you have.
For a few year ago, I repaired a fault that had close to the same symptoms, it was a cambridge azur xxx amplifier, in this cambridge it was a defect smd component that they used as a input multiplexer.
I look forward to repair this fault in the future. Nowadays i alway collect schematics and create repair e-books and/or repair movie guides in the fault finding process.
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May not be serious,first with good channel playing move all controls and switches on the amp,Dead spots can occur on controls especially if they are rarely used.balance controls,tape monitor switches etc so work them all.If fault doesn't clear try headphones,switched sockets can cause problems.next swap input signal leads,left to right. and if still no good try swapping over speakers left to right.STILL no sound? its the amp.Time for tools and a test meter.You can look for blown fuses but its never a good idea to replace a blown fuse without testing the circuit first.may cause further damage and put up the repair cost
If your 2100ES has a selectable INPUT AND OUTPUT and if you're intending to send all signal to the power amp, i.e. not bi-wiring or using the 2100ES to run mid-range or treble then you simply send Left & Right audio (White & Red cable) from a 2100ES output, probably AUX OUT ( it doesn't really matter apart from Phono on some units) straight to the power amp on AUX IN.
We should be just dealing with audio here, so connect the NAD audio output to CD or DVD IN. Select CD or DVD IN on 2100ES input switch and switch output to AUX OUT (whatever you decided goes to the power amp) on the 2100ES. Turn power amp to AUX IN and it will now get an audio signal from the 2100ES for amplification.
Speakers connect to the power amp as a normal amp, so pos and neg etc. The 2100ES now only acts as a signal feed, the power amp does all the work.
So, summary - switch on the NAD, press play - video goes separately and audio goes to the 2100ES. Turn 2100ES to INPUT for NAD. Turn 2100ES to OUTPUT allocated for power amp. Turn INPUT on power amp to allocation for 2100ES.
In a sound system there is an input selector switch which just connects the input socket you want to use to the "common" amplifier electronics inside...You say that the CD is fine so in this case it must be a faulty selector switch or broken copper tracks or wires inside the chassis electronics which connect those inputs.. through the selector switch to the amplifier circuitry.
The fault lies between the selector switch and the input sockets that dont work.....Not the CD one of course... thats fine..
I have the same problem which started about a month ago and seems to be getting worse.
I also noticed today, that 1 channel is significantly louder than the other - fault in the pre-amp stage, as feeding the power stage directly gives balanced, albeit extremely loud sound!
Looking on eBay, I found someone else selling an amp with both problems. It would nice to think that NAD would acknowledge a design flaw, and fix for free, but my amp is 5 year old.
Turn the ignition key to on or accessory position, turn the stereo off, then hold the function key for a couple seconds, the stereo will turn on and you scroll through the menu with the left and right arrow buttons and change settings with the up and down buttons