HI... After doing some work on one : Remove all the screws in the bottom panel ( not the feet though) Lift the panel away from the unit and you'll find the memory battery towards the rear of the main PCB . The battery type is : CR2032 3Volt and VERY available. I took a bunch of hi-res pics of the innerds too. Next to check is a Yamaha PD-250 stage-grand
Message
Battery/change info for Korg 01/W and Pro series
2009-03-30 by Scott