Brother HL-5140, HL-5150D, HL-5170DN - page 103

ROUTINE MAINTENANCE 5 - 11
6 Put the drum unit assembly in t he printer.
Make sure that the printer is turned on, the front cover is open and the Status LED is red.
Figure 5-20
7 Reset the drum counter. See the instructions supplied with the new drum unit.
Caution
■The Drum LED indication does not disappear until you reset the drum counter.
■Do not reset the drum counter when you replace only the toner cartridge.
8 Close the front cover.
9 Make sure that the Drum LED is now off.