Be sure to back up any data and unplug the unit before installation. Installation of this part along with any associated risks involved in the process are the responsibility of the buyer. Requires desoldering and soldering to install: It also has a memory backup battery as standard but bear in mind that if it has never been replaced then its probably completely dead and possibly corroding the. KORG POLYSIX POLY-61 POLY-800 Mono/Poly DW-6000 RK-100 Original Keyboard Key This is Genuine and Rare KORG POLYSIX/ POLY-61/ POLY-800 MonoPoly/ DW-6000/ RK-100 Original Keyboard Key Made in JAPAN. ….along with many others that use a 3V CR2032 battery If you don't use them to actually power the synth they will keep the memory alive for a couple of years.