Ricoh M281 Series Service Manual page 132

Hard Disk Drive Option Type P8 (M500-05) (SP 5300/5310 Only)
21. Remove the controller box cover [A].

The screw [B] is a small screw. Be careful not to use the wrong screw when installing
the controller box cover.
22. Remove the controller board [A] with the BiCU [B].

Be careful not to damage the backside of the controller board [A] and the BiCU [B].
23. Connect the two cables [A] to the HDD [B].
D255/D256/M281/M282 2-104 SM