Brother DCPJ525W Service Manual page 182

(23) A head/carriage unit is assigned a property code that represents the properties unique to
that head/carriage unit. The property code is printed on head property labels--bar code label
and QR code label, each of which is attached to the lower cover and head/carriage unit,
respectively.
When you remove the head/carriage unit and store it separately from the machine, remove
the property label (bar code label) from the lower cover and store it together with the head/
carriage unit.
If you replace the head/carriage unit, attach the property label (bar code label) that comes
with the new head/carriage unit to the lower cover as shown below.
Head/carriage unit
Head property label
(QR code)
3-45
ALR7795500000
HEDC6101119 000ZG
Property code
(13-digit)
(3_039)
Confidential