Vintage Synth Repair

Hi, I have a Roland Juno-60 that is turning on but nothing is 
happening. When you first turn the unit on the Tape, Load, lights 
flashes and the LED display only shows on the left side a 8 (or 
something like a 8). If you press the keyboard you only hear pitch 
changes..static sounding sound. I replaced the battery, and checked 
the power supply for correct volts. Not sure what else to do.  
Thanks...