Overview 
1.4.9Disassembly of the fan
1.  Remove the rear cover;
2.  Disconnect the tail board fan connector and remove 4 M3X30 screws, and then 
remove the tail board fan; 
Figure 2-35 Disassembly of the tail board fan
3.  Disconnect the back board fan connector and remove 8 M3X30 screws, and 
then remove the back board fan. 
2-26 DP-3300/DP-3200 Service Manual(V1.1)