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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.
Getting the connections right is a problem. One thing I find helps is the THX DVD discs that certain movies have on them. They have a sound set up to get it right. It makes a tone for each channel so you can hear which channel is working. It should help you set up the system right and determine if any channel has a fault on it.
have you tried looking at your phono leads,turn volume down until it is low enough that you can still hear the music playing,give the phono leads a turn to see if its a loose connection.if not,try the right channel phono in the left channel to see if this fixes your problem.also you could do the same with your speaker leads and see if that solves the issue.maybe a bad connection is the cause?.it may also help to try and move your cd player away from your amplifier.it could also have been overdriven (played too loud for too long) on the night of the party,only you will know if this was the case or not.
Good day sir/maam, to verify if the right channel is the problem, swap the speakers to confirm. Assuming that the right channel is the problem, set the balance control to the right (or simply disconnect the left speaker) and place you ear near the problem right speaker. Adjust the volume control up and down several times. you should hear a soft hiss that goes up and down also. this comfirm that the power amplifier stage is good. the problem is anywhere from the tuner/tape/cd/switch or jack. If you dont hear the hiss sound then the power amplifier is the problem. in both cases, you may need to bring it to a service center. hope this helps.
In old stereos the first things I look at are output transistors, solder joints and electrolytic capacitors. If you know how to solder, bad solder joints are pretty obvious. If you need a tutorial on how to spot bad solder joints, look here.
As for bad caps, look here. The info is aimed at computer motherboards but still helpful.
There could be a number of causes for this from as simple as a dirty switch to a power supply feed to the left channel being open. Without looking at the unit, it is had for me to say. Is it worth it? In my opinioon, yes. Figure on $5-$25 for parts.
volume levels on all channels varies depending on what dsp mode you are using. to be able to determine the level you desire, just chnge the level setting of those channels. either you do it by remote control or the front panel of the amp. try setting the dsp mode on disco and you should hear higher vol levels on all channels. Do not expect as well all channels to produce same vol levels as your effects speakers may not be able handle higher power levels.