If the TPM chip fails, you can restore the encryption key to the replaced TPM chip by using its backup. Follow the steps below to replace the TPM chip while the password is encrypted.
Press the 
button to turn on the printer.
The printer's control panel displays a message that the TPM has been replaced.
Select Restore from Backup.
When the administrator password has been set, enter the password and tap OK.
Connect the USB memory that contains the encryption key to the printer's external interface USB port.
Tap Restore from Backup.
The encryption key is restored to the TPM chip.
Check the message, and then tap OK.
The printer restarts.