Toshiba e-STUDIO 2555C Service Manual page 768

SRAM Key FROM Key
Status
Keymismatch Keymismatch
[F100_2] HDD format error (HDD encryption key data damaged - both boards)
Classification
Other service call
Check item
Encryption key status
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)
SRAM Key FROM Key
Status
* AccessFailed
AccessFailed *
e-STUDIO2555C/3055C/3555C/4555C/5055C
ERROR CODE AND TROUBLESHOOTING
Status
<The error occurs when the SYS board is replaced>
Recover the encryption key on the SYS board.
 P. 9-22 "9.2.4 Precautions and Procedures when replacing
the SYS board" ([D]Restore encryption key)
<The error occurs except when the SYS board is replaced>
Replace the SRAM board (for the SYS board).
 P. 9-26 "9.2.5 Precautions and procedure when replacing
the SRAM board (for the SYS board)" (all steps)
HDD format error: Encryption key data of both the SYS board
and the SRAM board for the SYS board are damaged.
Check the displayed message. ([3] + [C] + [POWER] → 5. Key
Backup Restore)
Status
Replace the SYS board.
 P. 9-22 "9.2.4 Precautions and Procedures when replacing
the SYS board" (all steps)
<With USB backup data: All key data recovery>
1. Recover all the data on the SRAM board.
[5] + [9] + [POWER] → 2. Restore SRAM Data from USB
(For details, see "12.1.4Cloning procedure [B]Restore
procedure")
2. Recover the encryption key/license on the SYS board.
Follow the procedures below noted in "9.2.4Precautions
and Procedures when replacing the SYS board".
[C] Restore ADI key (only when ADI-HDD is installed)
[D] Restore encryption key
[E] Restore license
Replace the SYS board.
 P. 9-26 "9.2.5 Precautions and procedure when replacing
the SRAM board (for the SYS board)" (for the SYS board, all
steps)
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