Canon MF720 Series Service Manual page 54

The figure below shows the multi-feeding prevention mechanism employed in this product.
■ Jam detection
● Overview
This product has the paper sensors as listed below to detect paper level and paper feed status.
• Registration sensor
• MP tray pre-registration sensor
• Fixing delivery sensor
• Fixing arch sensor
• Pre-registration sensor
• Cassette paper sensor
• Delivery full sensor
The following jams are detected in this product.
1. Pickup delay jam 1
2. Pickup delay jam 2
3. Pickup stationary jam
4. Fixing / delivery delay jam
5. Delivery stationary jam
6. Fixing seizure jam
7. Internal paper remaining jam
8. Duplex re-pickup jam
9. Open door jam
● Delay jams
Pickup delay jam 1
This occurs when the leading edge of the paper is not detected by the registration sensor
re-pickup.
*
: SR4
Pickup delay jam 2
This occurs when the leading edge of the paper is not detected by the MP tray pre-registration sensor (SR7) within the pre-defined
duration after the paper is fed from the multi-purpose tray.
Fixing / delivery delay jam
This occurs when the leading edge of the paper is not detected by the fixing delivery sensor
re-pickup; or when the leading edge of the paper is not detected by the delivery full sensor
the trailing edge of the paper is detected by the registration sensor.
*1
: SR8
*2
: SR15
Separation roller
<Normal-feed>
Pickup roller
Media
Lifting plate
The separation roller does not rotate.
<Multiple-feed>
46
2. Technical Explanation
*
from the start of image formation to
*1
within the pre-defined duration after
*2
during the pre-defined duration after