Ricoh D009 Service Manual page 635

MFP Options
When the controller board is defective [A] and needs to be replaced, "Encryption key
restoring" is required in order to use the data on the NVRAM and HDD. This is because this
encryption function works properly only when the keys in the controller board, NVRAM and
HDD match each other. SC858, 859 or 878 occurs if there is a problem with restoring or
updating the encryption key. (For details of how to update the encryption key, refer to the
Operating Instructions.)
The customer engineer then asks an administrator to input the encryption key [B] into an SD
card [C]. Encryption key restoring is completed [D] after installing (by the CE) and activating
(by the administrator). The details of the procedure are the same as for installation (
Installation – Section 1.22 "HDD Encryption Unit")
SM 6-85 D009/D011/D012/D013