Reversal Delay Jam - Canon i-SENSYS MF229dw Service Manual

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Technical Overview > Pickup And Feeding System > Reversal Delay Jam

Reversal Delay Jam

A reversal delay jam is determined when the Fixing Delivery Sensor (PS701) detects absence
of paper at the time of 440 msec elapsed after the start of reversal operation.
Note :
The jam margin is 30 mm.
The sum of the distance from the reversing position to the leading edge detection
position of the delivery sensor (PS701) plus the jam margin of 30 mm is equal to
520 ms at full speed and 1040 ms at half speed in terms of time. From the times, the
delivery sensor (PS701) detection time of 30 ms is subtracted to calculate the jam
judgment time.
● Re-pickup Delay Jam
After the start of reversal, if the TOP sensor (PS751) does not detect paper within 2445 (4895)
ms after paper detection by the delivery sensor (PS701), a re-pickup delay jam is determined.
Note :
The jam margin is 90 mm. This margin is set long because the paper path after reversal
between paper detection by the delivery sensor (PS701) and that by the TOP sensor
(PS751) is long, the paper path length depends on the paper quality, and the stop time
at the registration shutter prepared on the path for skew correction depends on the
delivered paper.
● Delivery Delay Jam during auto delivery
A delivery delay jam is determined if the Paper Lead Edge Sensor (PS751) detects presence
of paper and the Fixing Delivery Sensor (PS701) detects absence of paper at the time of 1115
msec elapsed after the start of auto delivery.
Note :
The auto delivery start timing is when the scanner stops.
2 Technical Overview > Pickup And Feeding System > Reversal Delay Jam
● Delivery Delay during cleaning
A delivery delay jam is determined if the Fixing Delivery Sensor (PS701) fails to detect
presence of paper within 1235 msec since the Paper Lead Edge Sensor (PS751) detected
presence of paper.
OFF
Paper Lead Edge
Sensor
ON
OFF
Fixing Delivery
Sensor
ON
1235
● Multi-purpose tray pickup delay jam
When the multi-purpose tray (MPT) is specified as the paper source and paper is at the multi-
purpose tray sensor, a feed delay jam is determined if the TOP sensor (PS751) does not
detect fed paper with 1370 ms after the start of paper feed from the multi-purpose tray.
When the specified paper source is MPT, no jam status is output but the MPT no-paper status
of the video interface.
2-30
paper detection
period
Jam
F-2-37
2-30