Tools Necassary: T-6 Driver, Prying Tool
Howto:
- Remove Battery Cover:


- Remove bottom plastic cover by using prying tool:


Here the clip of bottom palstic cover:


- Open 6 screws:


- Now the back housing can be take out

- Take out main module by prying these clips:




- Now the main-board can be take out after release these connectors:


- All done. Now you can clean trackball or do something else


Sorry about my poor English.