I first thought the right channel had gone completely dead. After checking, I found out that the channel wasn't completely dead, but the volume had dropped considerably. I have tested the right speaker and speaker-cable on the amplifier's left channel, and then it works fine. I have also removed all the inputs to the amplifier and tried with other inputs. The problem is still there. My conclusion hence is that the problem is in the amplifier. Anybody having any suggestions on what's wrong with my amplifier? Thanks.
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If the sound is also dead on that channel on a pair of headphones. Then you have probably lost the main power amp for that channel. To be certain. With you headphones on, slide or turn the balance control so you can only hear the faulty channel. With some music playing turn up the volume. If you can hear "faintly" music playing then the pre-amp is OK and the power amp has gone. The power amp will be located on a heat sink. It will consist of 4 transistors (2 for each channel) or one big device (or two) (an IC). If it is transistors you only need to replace the two for the right channel.
Make sure the audio level on the left and right channels are balanced. Check the menu for audio levels to adjust and make sure they are not maladjusted. If all levels are adjusted properly then the volume control or volume control circuity may be at fault.
Though any transistor(s) might well have gone and the capacitor could be changed, I see no reason to change any resistor unless it's burnt up or giving an incorrect resistance reading. A multi-meter will tell you if a resistor is working or not, if it's not dead or weak it won't make a lot of difference to the circuit, but replacing it will simply cost you more money!
The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.
disconnect everything in the back of the unit. reconnect only the cd to the imputs. also,just to be sure, disconnect all speakers(label them). fire it up,play a CD, connect the speakers 1 at a time. If the 1st works you have hope ,if not, try each channel individualy.The one that reduces volume is the problem-maybe shorted cable, bad speaker,or , God forbid-Bad amp Channel. good luck
Feed the amp with the left channel preamp to the right channel input on amp and check output.
If you get output from amp then pre amp nedds to be checked out if still no output then amp is suspect.