Canon iR2020 Series Service Manual page 112

Chapter 2
b. Machine with a DADF
1) Remove the two screws [1], and then detach the stream reading glass holder [2].
2) Remove the stream reading glass [3].
Mount the stream reading glass with the notch [1] of the sheet material affixed to the glass is at the front left.
3) Remove the screw [1], and then remove the jump board [2].
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