Brother MFC4820C Service Manual page 198

SERIAL NO. DESCRIPTIONS
The machine has a serial number label for the machine itself and four property labels for the print
head unit, air pump & motor module, paper feed roller and paper ejection roller.
This section gives coding information of those serial numbers and property codes.
(1) Serial number label for the machine itself
Location
Serial number
Barcode
App. 1-1
Product item code
Serial number (6-digit)
Factory
Production year
(Example) 2002 : 2
2003 : 3
Production month
January : A July
February : B August
March : C September
April : D October
May : E November
June : F December
: G
: H
: J
: K
: L
: M