Brother DCP-9045CDN Service Manual page 122

(23) Close the Back cover.
(24) Close the Front door unit ASSY.
Front door unit ASSY
(25) After replacing the Laser unit, reset the counter. (Refer to
in this chapter.)
Fig. 2-46
Fig. 2-47
2-28
< Back side>
Back cover
"2.3 Parts Life Reset Function"
Confidential