
 
Obsidian Series 800D 
 
USER MANUAL
 
16 
 
2.5. 
How to use the CPU heatsink backplate door 
Step 1 – Gently press on the tab and pull the CPU heatsink backplate door downwards. 
 
Step 2 – Once you have successfully installed your heatsink, simply lift the door up and 
press until it latches shut.