1.Remove the screws from the frame and pull off the keycaps (Skip this part if you have a plastic frame version keyboard.)
2.Take out all the side frames
3.Remove the screws on the PCB (Total 6 pcs) as shown in following image.
4.Then you will be able to take out the PCB. (Note: Please be careful of the toggles on the side when you disassemble the keyboard and reassemble it.)
FYI: If there is no problem with the keyboard, it is not recommended to try this at home as it can risk injuries and keyboard damage caused by the disassembling. Disassembling the K6 will invalidate the returns and exchanges guarantee.