One problem is if somebody has put a plug into the INSERT jacks on the back. If signalls have been driven into these that are intended to be used for external effects, an op amp can be blown and it is a pain to replace. Try plugging a se of headphones into each and see if you can hear a signal. You will only hear it in the LEFT headphone and this is normal. Make sure ALL the channels have the L/R switches punched down as these send each cahnnel into the MAIN mixing bus.
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