Ricoh IM 550F Field Service Manual page 134

2.Installation
27. Remove the controller board [A] with the BiCU [B].
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Be careful not to damage the backside of the controller board [A] and the BiCU [B].
28. Remove the HDD with the bracket [A] from the controller box [B].
29. Remove the HDD [A] from the HDD bracket [B].
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