I’ve got a Robocop that has no sound coming from the left speaker. I’ve checked all connections including the ribbon cable. My guess is a dead left channel amplifier. I can’t find schematics for the sound board. In this picture, which is the left speaker amplifier? 1,2 or 3?
61C9AB70-A7B0-481B-9E99-B31BEFFB5572 (resized).jpeg