Brother MFC5890CN Service Manual page 359

Reading Labels
An individual machine has a "serial number label" for the machine itself and "property labels"
for the head/carriage unit. An individual ink cartridge also has a "manufacturing information
label."
This section lists the coding information for those serial number and head property data.
(1) Serial number label for the machine itself
(app01a)
Location
(app01b)
Serial number label
Confidential
App. 1-1