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I don't think that will cure the problem. Volume controls these days are done by an IC. If it fails it can cause the volume to go up on one channel and not on the other. If you trace the wiring back from the volume control you will eventually run into the chip. I would have thought that the two channels will go into one chip and not two separate chips for each channel, but it depends on how complex the system is. If you are lucky the PCB will even tell you that the area is tone and volume control.
Have you checked all your speaker connections? And your Speaker selection a-b? If yes then Does your volume indicator show the volume increase when turning the volume up? If so, then try a different speaker . To check your speakers you can take a 9v alkaline battery and momentarily touch the leads to each speaker after disconnecting them from the stereo(black is ground and the striped wire is positive) You should hear a thump from the speaker.
Or just check them with another stereo or sound source. If the speakers are ok then you have a problem with the amplifier section of the receiver. There are no fuses internally in the Yamaha RS-700
Turn the squelch control anti-clockwise all the way, make sure mike is plugged in because it is part of the circuit, if radio is connected to a cb antenna you should get audio sound even if it's static it sound, go to channel 19 the trucker channel tend to pick up more activity.
So the speakers and the individual amp channels work so that lets out the obvious big hardware items.
This is starting to sound like an obscure setting was set or changed by mistake.
It would be nice to figure out what that is/was in case it happens again but you may eventually have to resort to resetting the receiver to factory defaults and start over by holding the1/0 button for 5 seconds.
Monitor volume is affected by TWO volume controls (or even three...) 1: Volume on the monitor can be set to 80% 2: Main Volume on the COMPUTER can be set to your liking. 3: Wave volume on the computer mixer settings should be set for 80% (See Sound on your control panel or right click your volume control near the clock)
If all these are right and the volume is still low, check that the audio is not set for surround 5 or 7 channel and the monitor audio connector is plugged into the REAR green connection on the computer.
Still problems, the audio driver in the monitor is shot.
Well, some TV stations do broadcast at different volume levels. This is very noticeable when watching a TV show and the volume seems normal and then when a commercial comes on, the volume is very loud. They do this to get you to pay attention to the commercial. Another problem might be that you are adjusting volume from both your TV and your cable box. What you should do is make sure your cable box is set to "FIXED VOLUME" and then just adjust your TV volume. Fixed volume will have the cable box output only one volume level, letting the TV do the adjustment. Just go through your cable box setting and look in the audio settings. Hope This helps...
Experience has shown that with this relatively new mode of transmission, audio levels can be quite dynamic. If your set provides it, you may try turning on "Audio Compress" or whatever the name might be. Could also be called Dynamic audio also or some such. Reason for all the hubbub is that along with HD, mixing engineers are also providing the most range for the audio dynamics as well the most video composition info in the new broadcasts...Accordianman.
You can check if channel 2 is blown by switching around your RCA plugs. If you are using the speaker wires as high power inputs you can change them. I.E. swap the left channel with the right one.
I assume you checked the gain control on the amp.
If channel 2 works with channel 3's inputs then its your head unit or the wiring.
If you are lazy take the amp to a car audio store and ask them to bench test it for you.