The receiver worked fine for years for my son. He gave it to me about a year ago. It was fine for a long time. Now the right channel is very quiet. We tested the speakers by moving them around and they are fine. It works fine using the B speakers only...perfect tone. Our speakers are old retro style, but I don't know what kind they are. I am thinking I need to open them up and find out what ohm they are. (?) Or, can you think of other ways I need to check it? are there fuses?
My problem is similar and i realize it's from these two tall cylinders and have become somewhat corroded. If i move them in a certain way the right speaker will come back on. I can't find a free REPAIR manual to tell what those cylinders are nor do I know if i can replace them.
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When you need to replace the output transistors, do them both at the same time with a matched pair. That way you won't unbalance the power supply and will be assured of the same power out is available on both channels.
This should be a relatively simple repair. The outputs for the right side could be out, but more likely, the switches and controls may need a good cleaning. Typically you can expect a labor rate in the $80-$100 range. If the channel is out, the parts cost could be between $15-$40.
If you can indicate your location, I may be able to suggest a shop.
check to see if there are any speaker wires that are touching each other near the connections. i had this happen on an onkyo receiver and found it was a purposeful feature intended to keep you from shorting out the receiver. if the + and - speaker wires touch (at the receiver posts or the speaker posts) this can happen.