Ricoh M281 Series Service Manual page 169

Print the encryption key and keep the encryption key (paper sheet) in a safe place. If the
encryption key is lost when you need it, the controller board, HDD and NVRAM must all be
replaced at the same time.

"NVRAM" mentioned here means the NVRAM on the controller board. It has no relation
to the "NVRAM" or EEPROM on the BiCU.
Please use the following procedure when the Data Overwrite Security and HDD Encryption are
reinstalled.
2.23.2 DATA OVERWRITE SECURITY (MP 501/601)
Before You Begin the Procedure
1. Make sure that the following settings (1) to (3) are not at their factory default values.
(1) Supervisor login password
(2) Administrator login name
(3) Administrator login password
If any of these settings are at their factory default values, tell the customer that these settings
must be changed before you do the installation procedure.
2. Make sure that "Admin. Authentication" is on.
[User Tools] -> [Machine Features] -> [System Settings] -> [Administrator Tools] ->
[Administrator Authentication Management] -> [Admin. Authentication]
If this setting is off, tell the customer that this setting must be on before you do the installation
procedure.
3. Make sure that "Administrator Tools" is enabled (selected).
[User Tools] -> [Machine Features] -> [System Settings] -> [Administrator Tools] ->
[Administrator Authentication Management] -> [Available Settings]
If this setting is disabled (not selected), tell the customer that this setting must be enabled
(selected) before you do the installation procedure.
SM 2-141
Security Setting
D255/D256/M281/M282