Canon DADF-Q1 Service Manual - page 119
Chapter 4
4-9
F-4-24
4) Open the DADF fully.
5) While opening the pickup middle guide found to the left of the feeding belt, aim a blower brush against the prism of the reflecting face of the reversal sensor
in view in the rear to clean.
F-4-25
4.2.4.12 Manual Feed Registration
0011-2686
1) Remove the body front cover.
2) Remove the main cover.
3) Aim a blower brush against the detecting hole of the registration sensor on the delivery upper guide to clean.
F-4-26
4.2.4.13 Pickup Roller
0011-2687
1) Open the pickup assembly upper cover.
2) Remove the pickup cover.
3) Clean the surface of the roller using lint-free paper or cloth moistened with alcohol.
F-4-27
4.2.4.14 Separation Belt/Feeding
0011-2688
1) Obtain a single sheet of A4 or LTR copy paper.
2) Remove the ADF controller cover, and set the DIP switch (SW1) on the ADF controller PCB as indicated.
[1]