Brother MFC5490CN Service Manual page 208

(5) Peel off the PF encoder disk from the PF roller gear L only when it should be replaced.
Note: Once removed, the PF encoder disk will become unusable and a new disk will have
to be put back in.
Note: Remove any adhesive remaining left on the PF roller gear L.
PF roller gear L
PF encoder sensor
PF encoder disk
Lower cover
(6_71)
Assembling Note: When attaching the PF encoder disk to the PF roller gear L, using a
spatular tool makes the job easier. Put on clean gloves to protect the disk surface from dust
or fingerprints.
6-58
Confidential