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First, plug it in. Next connect the speakers. Center all eq controls both master and channel. Turn off any reverb or effects. Turn the master volume 1/2 way up. Plug a sound source into channel 1 wiyj the channel volume all the way off. Turn on the amp. Slowly raise the channel volume until you heat output. If you get nothing, it's broken.
That light is showing that there is power to amp in that speaker but there is something wrong with the amp or the speaker inside and nothing is coming out. You will have to troubleshoot the amp and check the resistance of the speaker to see what the problem is.
Check the caps in the PSU, these give out over time although not normally when used regularly. You may be lucky and be able to see one or more with bulging tops. If you can replace them and all MAY be OK. Whilst in there check for any visible signs of anything burnt or blown. If it looks too bad or there is nothing obvious it's a trip to the repair shop for certain.
What do you mean by "Plug one side"? Your guitar is mono....you plug into the channel with a mono signal cable....as long as you're panned to center on your channel strip, you would have full mono sound out...ie sound equally from both speakers. Usually you would be running your board in mono anyway.
It appears from the manual that 00 is 100% full intensity just as you are observing... I can understand how you would be confused by the way it is written in the manual...
It also looks like you have to set chan 1 to be between 0 to 29 to select the RGB mode...and ALSO those color intensity values are "upside down", that is, 00 is full on for each color. and 255 is off.
I suspect you MAY have a severe ground loop. The green light indicates channel crossover if nothing plugged in.
MAKE SURE ALL connected equipment is powered from the SAME receptacle. If you service amps from receptacles at one end of the room and this board from the other end, you are ASKING for trouble.
Read up on "common mode" as it pertains to balanced lines. Equipment can be at risk if grounds "bounce" as they often do.
When green light with no inout shows up, slide all faders down first. Then unplug input lines one at a time... turn off the amps and then unplug the output lines one at a time. See if one of these inout or output lines was causing the green light.
You should be using BALANCED lines to your amps... either XLR or TRS types at both ends.
Sounds like an electrolytic capacitor that has faulty electrolyte. Look for the culprit in the power supply area. It looks like a can covered in usually light or dark blue plastic. It's end may have developed a 'bulge.' This usually occurs with capacitors around 10 years of age or heavily used over a long duration, or under very hot conditions.
You may also want to make sure all solder joints in the power supply are good.
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