Brother MFC-3340CN Service Manual page 301

(2) Head property label
n
Property label for the head/carriage unit
Head property code
Location
Production lot number
Serial number (6-digit)
Production year
(Example) 4 : 2004
5 : 2005
Production month
A : January G : July
B : February H : August
C : March J : September
D : April K : October
E : November
May L :
F : M : December
June
ead property label
App. 1-2
Confidential