Ricoh M281 Series Service Manual page 126

Hard Disk Drive Option Type P8 (M500-05) (SP 5300/5310 Only)
10. Remove the power connector cover [A].

When removing the power connector cover, pull it in the direction of the arrow.

Be careful not to damage the hook on the power connector cover when you remove
or install the power connector cover.
D255/D256/M281/M282 2-98 SM