Brother MFC640CW Service Manual page 301

SERIAL NUMBERING SYSTEM
Individual machines have a serial number label for the machine itself and a property label for the
head/carriage unit. Individual ink cartridges also have a serial number label.
T his section lists the coding information for those serial numbers and property codes.
(1) Se rial numbe r labe l for the machine itse lf
Location
Serial number
Barcode
Lower cover
App. 1-1
Product item code
Serial number (6-digit)
Factory
Production year
(Example) 5 : 2005
6 : 2006
Production month
A : January G : July
B : February H : August
C : March J : September
D : April K : October
E : L : November
May
F : June M : December
Serial number label
Confidential