Canon imagePRESS C10000VPSeries Troubleshooting Manual page 206

F) When opening and closing the shutter manually 2
When opening and closing the shutter manually by holding and sliding the slider [1] by hand, the grid cleaning unit [2] may come
off the shutter slider if a force is applied in the direction of the arrow [a]. The photo [B] shows the unit in a normal state. When
moving the slider, be sure not to apply a force in the direction of the arrow [a].
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