Toshiba e-STUDIO556 Service Manual page 136

SRAM Key FROM Key
Status Status
OK
Key Null
Key Broken
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".
Remark:
If the error is not cleared, reinstallation of the OS data, master data and application is needed.
SRAM Key FROM Key
Status Status
* Access Failed
Access Failed *
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Recover the encryption key on the SRAM board.
 P.9-27 "9.2.7 Precautions and Procedures when replacing SRAM
board" ([H]Backup encryption key)
<The error occurs when the SYS board is replaced>
Recover the encryption key on the SYS board.
 P.9-20 "9.2.4 Precautions and Procedures when replacing the SYS
board (for e-STUDIO556/656/756/856)" ([E]Restore encryption key)
<The error occurs except when the SYS board is replaced>
Replace the SRAM board.
 P.9-27 "9.2.7 Precautions and Procedures when replacing SRAM
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)
Replace the SYS board.
 P.9-20 "9.2.4 Precautions and Procedures when replacing the SYS
board (for e-STUDIO556/656/756/856)" (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]Restoring procedure")
2. Recover the encryption key/license on the SYS board.
Follow the procedures below noted in  P.9-20 "9.2.4 Precautions and
Procedures when replacing the SYS board (for e-STUDIO556/656/756/
856)"
[D] Restore ADI key (only when ADI-HDD is installed)
[E] Restore encryption key
[F] Restore license
Replace the SRAM board.
 P.9-27 "9.2.7 Precautions and Procedures when replacing SRAM
board"
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Measures
Error item
Measures
Measures
e-STUDIO556/656/756/856/557/657/757/857
ERROR CODE AND TROUBLESHOOTING
8