Brother HL-1435 - Manual (Page 70)

ROUTINE MAINTENANCE 5 - 6
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 5-8 and Figure 5-9 to prevent any degradation to the print
quality.
6
Put the new toner cartridge firmly into the drum unit until you hear it lock into place. If you put it in
properly, the lock lever will lift automatically.
Figure 5-10
Caution
Make sure you fit the toner cartridge properly or it may separate from the drum unit.
Figure 5-8 Figure 5-9