Asus PSCH-SR/SCSI - Manual (Page 26)

2-8 Chapter 2: Hardware information
5. When the CPU is in place, push
down the socket lever to secure
the CPU. The lever clicks on the
side tab to indicate that it is
locked.
3. Position the CPU above the
socket such that its marked
corner matches the base of the
socket lever.
4. Carefully insert the CPU into the
socket until it fits in place.
The CPU fits only in one correct orientation. DO NOT force the CPU
into the socket to prevent bending the pins and damaging the CPU!
After installation, make sure to plug-in the 4-pin ATX power cable to the
motherboard.
Gold Mark
2. Unlock the socket by pressing the
lever sideways, then lift it up to a
90°-100° angle.
Socket Lever
90º ~ 100º angle
Make sure that the socket
lever is lifted up to 90°-100°
angle; otherwise, the CPU
does not fit in completely.