Brother HL-5150D - Manual (Page 98)

5 - 6 ROUTINE MAINTENANCE
Caution
Put the toner cartridge in the drum unit immediately after you have removed the protective cover. Do
not touch the shaded parts shown in Figure 5-9 and Figure 5-10 to prevent any degradation to the
print quality.
6
Put the new toner cartridge firmly into the drum unit you hear it lock into place. If you put it in
properly, the lock lever will lift automatically.
Figure 5-11
Caution
Make sure you insert the toner cartridge properly or it may separate from the drum unit.
Figure 5-9 Figure 5-10