Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 98

(14) Close the Back cover.
(15) Close the Front door unit ASSY.
Front door unit ASSY
(16) After replacing the Laser unit, reset the counter. (Refer to
in this chapter.)
Fig. 2-36
Fig. 2-37
2-21
< Back side
Back cover
"2.3 Parts Life Reset Function"
Confidential