45584901TH Rev.1 6-16 /Oki Data CONFIDENTIAL6.2.4 Precautions and Procedures when replacing the CU boardA procedure for CU board replacement is shown below.[C] Restore ADI keyStart[A] Return License[D] Restore encryption key[G] Reinstall license[F] Update firmware version[H] Check firmware versions[E] Restore licenseSetting completed[B] Replace the CU boardFig.6-23[a] Return LicenseNotes:• If the Setting Mode (08) is not started up, "[A]Return License" can be omitted. In that case,reinstall the license with "[1]Re-registration when the board is replaced" if it is clearedsince "[G] Reinstallation of License" cannot be performed.• When installing the Data Overwrite Enabler (GP-1070) and security mode is setting HighSecurity, set the security mode levlel to "1" (Low level). Then restart the equipment.(1) Start up with the Setting Mode (08).(2) Enter the password, and then press the [OK] button.(If the password is not set for Service, press the [ENTER] button without enteringanything.)(3) Key in [3840], and then press the [ENTER] button.(4) Select the license to be returned, and then press the [REMOVE] button.(5) Install the one-time dongle, which you used for uploading the selected license, in theequipment, and then press the [OK] button.(6) The Remove screen is displayed, then press the [YES] button. If this screen is notdisplayed, check whether the one-time dongle is installed in the equipment properly.