Canon imageRUNNER ADVANCE C3330 Series Service Manual page 308

4. Put a sheet of half folded A4 paper[1] under the Reader Scanner Unit.
5. Loosen the 1 Screw [1]. Remove the Belt [3] from the pulley while releasing the Tensioner [2].
1x
6. Pick up the Reader Scanner Unit [1] and remove the Belt [2].
CAUTION:
Do not pull the Reader Scanner Unit or the Flat Cable [1] may be damaged.
[1]
[1]
[1]
4. Parts Replacement and Cleaning
[2]
[1]
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[3]
[2]