Brother MFC Series Service Manual page 299

(2) Head property label
The Head/carriage unit property code is printed on the head property label. The head
property label is attached to the Head/carriage unit.
Head property code
■ Head property label on top of the Head/carriage unit
Location
Head property label
(app1_002L) (app1_002L)
App. 1-2 Confidential