Oki MC770 series, Maintenance Manual

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45584901TH Rev.1
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Oki Data CONFIDENTIAL
5.3.6 Other service call
[F100_0] HDD format error (Operation failure of key data)
Classification Contents
Other service call HDD format error: Operation of HDD key data fails.
Check item Measures
Setting Reboot the equipment.
If it cannot be recovered, reinstall the software in the following procedure.
1. Install the system firmware.

P. 8-3 "8.2 Firmware Updating with USB Device"
[F100_1] HDD format error (HDD encryption key data damaged - one board)
Classification Contents
Other service call HDD format error: Encryption key data of either the CU board or the
SRAM board for the CU board are damaged.
Check item Measures
Encryption key status Check the displayed message. ([3] + [C] + [POWER]
→
5. Key Backup
Restore)
Take appropriate countermeasures shown in the table below according to the messages
displayed in “SRAM Key Status” and “FROM Key Status”.
Remarks:
If the error is not cleared, reinstallation of the system firmware, system software and
application is needed. ([4]+[9]
→
Power-ON)

P. 8-3 “8.2 Firmware Updating with USB Device”
SRAM Key
Status
FROM Key
Status
Measure
OK AccessFailed Replace the CU board.

P. 6-16 "6.2.4 Precautions and Procedures when replacing the CU
board" (all steps)
OK KeyNull Recover the encryption key on the CU board.

P. 6-16 "6.2.4 Precautions and Procedures when replacing the CU
board" ([E]Restore encryption key)
KeyBroken
AccessFailed OK Replace the SRAM board (for the CU board). (USB backup data are
not used)
 P. 6-20 "6.2.5 Precautions and procedure when replacing the
SRAM board (for the CU board)" (all steps)
KeyNull OK Recover the encryption key on the SRAM board.

P. 6-20 "6.2.5 Precautions and procedure when replacing the
SRAM board (for the CU board)" ([H]Backup encryption key)
KeyBroken
Keymismatch Keymismatch <The error occurs when the CU board is replaced>
Recover the encryption key on the CU board.

P. 6-16 "6.2.4 Precautions and Procedures when replacing the CU
board" ([E]Restore encryption key)
<The error occurs except when the CU board is replaced>
Replace the SRAM board (for the CU board).
 P. 6-20 "6.2.5 Precautions and procedure when replacing the
SRAM board (for the CU board)" (all steps)