Question about NAD C350 2-Channel Amplifier

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Gem Sound XP-350 both channels failed

Neither of the channels on this amp work. every connection inside seems to be intact. i've tried this with every volume level and bridged and stereo settings. it shuts itself off after both channel volumes exceed 40%, though no sound is coming from these channels. sound is still produced when the speaker jack is removed though. what can I do to try to isolate the source of this problem? the fuses in the amp all look good...

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  • frunobulax Dec 17, 2007

    I too have an XP-350. When I turn it on, it powers up for a second or two, and then an internal relay shuts it off. This happens even with no input or output connected. This was a sudden failure...One day I turned it on, and it had stopped working.

  • WUWOFgtr Dec 19, 2007

    that's been happening to me a few times. I think I may have found the root of some of my problems. I got this amp secondhand, and apparently the previous owner switched every single fuse in the amp with a 8A 250V 5mmX20mm fuse. so i noticed the circuit board says 10A on it, which would explain why my fuses have bitten the dust since posting originally. as for it not powering on at all, I just discovered a hidden fuse box below the power cable plug. I blew a fuse in there, and that caused my amp to stop turning on. I was able to replace it and power it up again though. I must ask you, assuming your fuses are all stock, what types of fuses the originals all are.

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  • 1,175 Answers

Speaker fuses are generally fast-blow styles 250 volt glass
If an amp shuts down, with speakers connected, it sounds like one of the power supply lines does NOT like what it's "seeing" . Probably output transistors bad ( or module)

Take it to a tech.

Scott out.

Posted on Jan 08, 2008

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1 Answer

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You will need to check on the failed channel with reference from the working channel. If the model is having an IC check for the fusible resistors in the biasing circuit. If not your output IC could be faulty.
Open the set and check for any loose connections. make sure your speaker is fine and cross check for confirmation.If the speakers , the fuses are intact, then you will need to signal test to see if the premap is working or the output is at fault. So check this out. Good day

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Also the main transistors in the power amp or if it has an output IC - that!
If you can in anyway disconnect the power supply section from the amp circuit, you can isolate which part is faulty. For if it blows when disconnected from the power amp, you know it's just the power supply that's gone. And if it does not blow - then it's the amp!

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website

http://www.gemsound.com/contact.html#


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Gem sound xp-350 clipping


Hi There,

You have given me a good clue to your problem....

You say that the CD player goes well and does not shut the system down like the Live connections. This is a single input configuration...

This means that there is sound levels coming in from the live multiple connections that are too strong (Loud) for the amp to handle...
Its a good amp you have as its shutting down to protect itself instead of blowing up....
So.... set up for the live show then disconnect all but one of the live inputs and start the live session if its OK, then connect another of the live connections, and see if its OK, if it is then connect another live one connecting each one progressively until the problem occurs again...this last live connection is the one that is too loud in signal strength for the amp to handle causing the shut down...

Solution is to reduce tha signal on that last cable source to a level that stops the shut down...I remember that groups of guitar players have volume controls on each guitar and if these are set too high then this can occur....specially if they are all using the same amp without a controlled "mixer man" monitoring each input signal.
Rember the small meters on the mixing panel which have a green painted area and a red painted area the "mixer man" must keep the each meter needle in the green zone for all the inputs otherwise a shut down occurs.
Hope this helps you...

Cheers From
YUBEUT

Oct 26, 2007 | Gem Sound GemSound PA-585 2-Channel...

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