Canon DADF-R1, Service Manual

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Chapter 3
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3.4.4 Separation Sensor (S4) and Skew Sensor (S5)
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The paper path is equipped with a separation sensor (S4) and a skew sensor (S5) to monitor the movement of
originals for the following:
A separation fault (delay) is identified if the separation sensor does not detect an original a specific period of
time after the separation motor has started to rotate.
F-3-28
Both separation sensor and skew sensor are used to find out whether an original is moving askew. These two
sensors are arranged in a single row in front-rear direction. An original is identified as moving askew if a
discrepancy in timing is detected when it moves past these sensors. If the discrepancy is an equivalent of 10 mm,
the DADF will assume that the original is moving askew, at which point it stops its operation to protect the
original and causes the copier to indicate a jam message.
Item Sensor used (notation) Alarm
Separation fault (delay) Separation sensor (S4) 0031
Skew Separation sensor (S4) 0011
Skew sensor (S5)
Separation sensor (S4)
Separation sensor does not detect an original for
a specific period of time
Separation sensor goes on within
a specific period of time
Separation sensor (S4)
Original moving askew
Skew sensor (S5)
Separation sensor (S4)
Discrepancy detected in timing
10 mm or more