SOURCE: Loud, knocking noises
probably the fuser or the fuser drive gear.
The ceramic gear on the fuser usualy breaks first, while the complete gearbox keeps on running breaking the plastic fuser drive gear s well.
To replace a fuser you'll only need to unscrew 4 or 5 screws i guess and disconnect 2 connectors.
To replace the fuser drive gear that's some other stuff.
SOURCE: Brother HL-5170 fuser reset
should be a service selection in the user tools/ menu. reset life/consumables/replacement etc.
SOURCE: BROTHER HL-5170 FUSER COUNT RESET
To reset the drum you have to hold down the go button untill all the lights light up and flash.
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