Canon iPF780 Series Service Manual page 84

The shutter is controlled at the following six positions.
From borderless
printing ink
receiving grooves
of BP
To Platen Suction Fan
[1]
Borderless printing
Shutter HP Sensor
Shutter
Shutter opening During borderless printing During bordered printing
position
[1] Only HP side open Yes (17 inch or shorter
media)
[2] Fully open Yes (B2 or larger media)
[3] Fully close
[4] 1/4 open
[5] 1/2 open
[6] 3/4 open
To Platen Suction Fan
[4]
[3]
[2]
Bordered printing
Shutter Motor
Shutter
F-2-22
Yes
Yes
Yes
Yes
Yes
[5]
[6]
From borderless
printing ink
receiving grooves
[2]
of HP
Chapter 2
2-25