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Right channel stop working - Samson SX1200 Amplifier

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Re: Right channel stop working

Cheak your speaker wire and speaker at right channel.

Posted on Jan 21, 2008

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As the channels are identical you can use the good channel has a guide to the bad one. First thing is to look around see if anything does not look the same as the right channel.

If nothing obvious stands out, with the power on, using an insulated screwdriver touch the two channels one at a time. Keep away from the power supply and anything that is common to both channels. The channel will buzz once touched. Depending which points you touch them. The right channel will tell you if it should buzz at that point. Work backwards from the speaker outputs if you can. If you hear a buzz on the left channel then it is working at that point, if it produces the same sound on the right.
Using this method you should track down the part that has gone.

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The power amplifier section should be troubleshoot for shorted output IC or transistor. If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience.

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Yes amps buzz when something gets near them - say a pen or probe and if you know what it is safe to touch a finger! Fortunatly for you the left channel is the same as the right. So if you believe it's the pre-amp work backwards from the where the power amp connects to the pre-amp, going through the pre-amp stage by stage - prodding the parts. Remember a buzz in the right a buzz in the left! No buzz in the left but one in the right fault found!
Ignore the power supply it's nothing to do with that as it's common to both channels.

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First, lets's determine if it's the amp or the preamp...

Swap the Left and Right channel cables between preamp and the amp with each other.

Did it stay on the right? = amp problem.

Now on the left? Preamp or source.

Plug any Line Level device (CD?) directly into the amp inputs. Work now? Preamp problem.

ALL sources? Preamp - toggle all controls, especially a Tape Monitor to possibly wipe of any built-up oxides in them.

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Nad C320 right channel stops working then comes back again

This sounds like the "pre-amp" section is cutting out or there is some interruption in the signal path. A few things to try:

1) With the unit off, try "working" the volume,balance and tone controls. This means, turn them up and down a number of times to clear any debris that may be in the controls themselves.

2) Work the input selector switch the same way if it is a rotary switch.

3) Try turning on/off the tape monitor switch a few times.

4) Keep track of whether this problem is sensitive to heat. Does teh channel shut down more quickly once the unit has been on for a while?

Lastly, if you can solder, look for any solder joint that appears grainy or has rings and resolder it.

Update this with your results and we'll continue on...


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