Canon imageRUNNER ADVANCE 4551i Service Manual page 228

8. Clean the Lead Roller 1 [1] with lint-free paper moistened with alcohol.
CAUTION:
When installing the Pressure Plate, check that the 6 Compression Springs are correctly set in the holder on the Lead Roller
side.
NOTE:
Opening the ADF Upper Cover releases the pressure and makes it easier to perform the work.
9. When cleaning the Lead Roller 2 [1], open the Rear Guide [3] and cover [2] of the ADF document reading area, and
clean the Lead Roller 2 with lint-free paper moistened with alcohol.
[1]
[1]
[3]
[2]
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4. Disassembly/Assembly