Canon Duplex Unit-A1 - 2.3 Detecting Jams; 2.3.1 Outline; 2.3.2 Delay Jam; 2.3.3 Stationary Jam

Chapter 2
2-10
F-2-10
2.3 Detecting Jams
2.3.1 Outline
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The following paper detection sensors are mounted to check whether paper is fed properly in the duplex unit:
- Duplex paper sensor 1 (SR1002) (upper)
- Duplex paper sensor 2 (SR1003) (lower)
Occurrence of a jam is detected according to whether paper exists at a sensor at the check timing memorized in the CPU. If the CPU judges that a jam has occurred,
printing is stopped and occurrence of the jam is reported to the image processor PCB.
This machine can detect the following types of jams:
- Duplex paper sensor 1 delay jam
- Duplex paper sensor 1 stationary jam
- Duplex paper sensor 2 delay jam
- Duplex paper sensor 2 stationary jam
2.3.2 Delay Jam
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Duplex paper sensor 1 delay jam
This jam occurs if the duplex paper sensor 1 does not turn on within the predetermined time after the delivery sensor in the host machine turns on.
Duplex paper sensor 2 delay jam
This jam occurs if the duplex paper sensor 2 does not turn on within the predetermined time after the duplex reversal motor starts rotating.
2.3.3 Stationary Jam
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Duplex paper sensor 1 stationary jam
- This jam occurs if the duplex paper sensor 1 does not turn off when the predetermined time lapses after the duplex paper sensor 2 turns on.
- This jam occurs when the duplex print paper sensor 1 does not turn off when the paper with a longitudinal length of less than 280 mm reaches the standby point
(about 90 mm downstream from the duplex paper sensor 2).
Duplex paper sensor 2 stationary jam
This jam occurs when the duplex paper sensor 2 does not turn off when the predetermined time lapses after the feed motor starts rotating.
SR1002
SR1003