Brother HL-3400CN Series - Manual (Page 9)

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Printer Do's and Don'ts for Optimum Print Quality
!
Caution
Before you move or lift the printer, remove the Toner Cartridges, Waste
Toner Pack, Oil Bottle and Fusing Unit to avoid spills. Be sure to keep
the printer as level as possible. Damage caused by failure to remove the
supplies will void your warranty.
!
Caution
Do not touch the rollers of the Fusing Unit. This can degrade print
quality.
Fig. 0-2 Fusing Unit Rollers