When you want to encrypt the password, you need to back up the encryption key. Prepare a USB memory for backup in advance. You need 1 MB or more free space in the USB memory.
When replacing the TPM chip, you need a USB memory that contains the encryption key. Store this in a safe place.
Select Settings on the home screen.
Select General Settings > System Administration > Security Settings > Password Encryption.
Select On for Password Encryption.
When a message is displayed, check the content, and then tap OK.
Select Proceed to Backup.
The encryption key backup screen is displayed.
Connect the USB memory to the printer's external interface USB port.
Tap Start Backup.
Writing to the USB memory starts. If an encryption key has already been stored in the USB memory, it is overwritten.
When a backup completion message is displayed, tap Close.
Press the 
button to turn off the printer.
Press the button to turn on the printer again.
The password is encrypted.
The printer may take longer to start than usual.