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1-check for blown fuse2-check for good cables to your loudspeakers (no short circuit between cabels wire.) about(nuorigin problem)-move the good speaker cables to the bad side and check if there is no sound the problem in your amplifier output stage and needs to be fix at workshop.
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Did you try to switch the loudspeakers? Before changing anything always lover the volume and switch off the amplifier. Assuming you tested already different inputs, you can be sure no cable from signal source is out or defect. (or did you nit check that first?). When the amp is switched off, disconnect the speakers and switch left to right and right to the left output.. If the other speaker is quiet now, you are sure it is in the amp. Still his can be anything. You can check the connections between the pre and main amplifier on the back side. When you have an extra set of interlink cables, perhaps you can cross the in and output there too. Take care every time you change something, lower the voltage and switch off the amplifier. Sudden clicks when switching on or changing anything can damage the amp and or the speakers.
Perhaps when you checked this you can locate where the problem is? Speaker, speaker cable, power amp, pre amp, (only a part of the pre amp.
Odd one! Normaly you would loose a channel if the main amp was down, or the pre-amp was. But clearly the main is working. The only conclusion is that there must be more than one pre-amp and that's why the Tape section works. The only way to solve this one is to go inside and trace the imputs to where they join the PC board.
A helpful hint is that if you touch the audio section with a srewdriver, it will buzz! And since you have two channels which copy one another you can work out where the fault is. Because if it buzz's in the good channel, it should in the same place on the bad one.
WARNING don't stick your srewdriver on power parts, and don't short any part out with it.
Do this, CD audio out jacks to the PRE-AMP INPUT jacks, then PRE-AMP OUT jacks to AMPLIFIER INPUTS then from AMPLIFIER to speakers, This will work similiar with any sound source unit ie. Radio Tuner, Tape deck, etc. Just think of it this way, a PRE-AMP is BEFORE the AMPLIFIER, all the AMPLIFIER is going to do is AMPLIFY the sound to your speakers, HOPE THIS HELPS!
check volume balance between right and left-then change inter connection between sound source and amplifier with new cabel(i prefer gold plated type connectors)(see radio shack). after that if the problem excit your fault in output transistors or output stereo ic depend on circuit design.