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Solution
Serial number (10 alphanumeric characters long, found on the label on the back side of the machine)
Caution
Checking the serial number from the operation panel
Press 
(
), and tap ⋖Check Device Configuration⋗.
(), and tap ⋖Check Device Configuration⋗.
You can also check by 
⋖Device Status⋗ ⋖Serial Number⋗.
⋖Device Status⋗ ⋖Serial Number⋗.