Canon DADF-M1 Service Manual - page 17
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110
Chapter 1
1-3
1.3 Using the Machine
1.3.1 Original Placement Indicator
0002-7214
The original placement indicator goes on when an original is placed in the original tray, and it flashes to indicate the presence of a jam.
F-1-3
1.3.2 Warning and Action to Take
0002-7215
If the original placement indicator starts to flash while an original is being moved, suspect a jam, and go through the following:
1) Check all originals in the tray.
2) Open the feeder cover, and remove any jammed original.
3) Put the originals in order starting from 1st to last page, and place the stack back in the ADF.
Original placement indication