I have a PSR s975 .. not sure if the A3000 is similar though
Questions !!
1. Is the left part "On" ? (LED Indicator glowing on L1)
2. Is the part volume up ? (Mixer settings, Left volume turned up)
3. Is the accompaniment off ? (Accmp button not lit up, If accompaniment button is lit and your style doesn't have an accompaniment data, you wont hear melody)
4. Check your split point settings