Canon M111021 ユーザーズマニュアル

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Adjusting the Separation Roller Gap
If double feed should occur too often, adjust the Separation Roller gap 
according to the following procedure.
1
Slide the Adjustment Dial Cover to the left.
2
Adjust the Adjustment Dial.
Turn the Adjustment Dial to the right 3 clicks.
If documents are not fed after the above operation, turn the 
Adjustment Dial back to the left 1 click.
3
Slide the Adjustment Dial Cover to the right.
CAUTION
Do not use the Adjustment Dial any other time except when 
adjusting the Separation Roller gap. Turning the Adjustment Dial 
too much may damage the scanner.
Adjustment Dial
Turn the dial to the 
left to widen the 
gap, and turn it to 
the right to narrow 
the gap.