Brother DCP7010 Service Manual page 250

(2) Laser unit serial label
LSU MODEL DISTINCTION
ERAME MANUFACTURER
AND MOLD DISTINCTION
T1 THE 1st. MOLD
Y3 THE 3rd. MOLD
POLYGON MOTOR DISTINCTION
REGARDING X delay and Y delay
It indicates required delay amount for writing in each of main (X) and sub (Y) scanning direction
Location
Laser unit serial label
INSPECTION MACHINE
App. 1-2
Y delay
X delay
SERIAL NUMBER
Confidential