Brother DCP-7030 Service Manual page 310

■ Laser unit serial label
<How to Read>
LUS Model distinction
Frame manufacturer
and mold distinction
T1 the 1st mold
Y3 the 3rd. mold
Polygon motor distinction
<Location>
Serial label
Fig. App. 3-4
Laser unit
Drive sub ASSY
Drive sub ASSY
2 to 10mm
Serial label
Fig. App. 3-5
App. 3-3
Y delay
X delay
Serial number
Inspection machine
Serial label
<Front side>
Confidential