Foxconn 661M03 - Manual (Page 20)

Chapter 2 Installation Instructions
12
661M03 Series User Manual
Warning:
Keep the retention locks lifted upward while fitting the retention
mechanism to the module base.
Retention Hole
Retention Lock
Retention Hook Snapped
to the Retention Hole
Attention:
1.Position the fan with the retention mechanism on top of the
heatsink. Align and snap the four hooks of the retention
mechanism to the holes on each corner of the module base.
2.Make sure that the fan and retention mechanism assembly
perfectly fits the heatsink and module base, otherwise you
cannot snap the hooks into the holes.