Toshiba Satellite A500 Service Manual page 203

4.18 CPU 4 Replacement Procedures
3. Secure the CPU by rotating the cam 120 degrees to the right with a flat-blade screwdriver.
NOTE: FOXCONN CPU socket will be 180 degrees to the left.
Figure 4-31 Securing the CPU
Satellite/Satellite Pro/A500/A505/A507/dynabook Maintenance Manual 4-53