Canon 1730, Service Manual

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Technical Explanation > Original Exposure and Feed System > Control of ADF > Jam Detection
Technical Explanation > Original Exposure and Feed System > Control of ADF > Jam Detection
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Jam Detection
Whether jam is occured or not, determined by whether there is paper or not in the sensor
area by the timing check that memorized in advance by the reader controller PCB.
When the reader controller PCB detected jam, it will stop feeding operation and display the
message in the operation panel about the jam occurrence.
As the machine stores the jam codes, it can be checked by outputting a jam error log report
in the service mode.
PS23
PS25
PS26
PS27
PS28
PS30
The jam is detected by the following sensors.
• ADF open/closed detection sensor (PS23)
• Lead sensor (PS25)
• Registration sensor (PS26)
• Stay sensor (PS27)
• Reversal sensor (PS28)
• Original set sensor (PS30)
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Jam type Sensor Jam description
Registration sensor delay jam PS26 When the registration sensor cannot detect an
original within the specified time.
Registration sensor stationary
jam
PS26 When the trailing edge of the original cannot be
detected after lapse of the specified time after the
original was detected by the registration sensor.
Lead sensor delay jam PS25 When the lead sensor cannot detect the original
within the specified time.
Lead sensor stationary jam PS25 When the trailing edge of the original cannot be
detected after lapse of the specified time after the
original was detected by the lead sensor.
Stay sensor delay jam PS27 When the stay sensor cannot detect the original
within the specified time.
Stay sensor stationary jam PS27 When the trailing edge of the original cannot be
detected after lapse of the specified time after the
original was detected by the stay sensor.
Reversal sensor delay jam PS28 When the reversal sensor cannot detect the original
within the specified time.
Reversal sensor stationary jam PS28 When the trailing edge of the original cannot be
detected after lapse of the specified time after the
original was detected by the reversal sensor.
ADF open jam PS23 When the ADF is opened during its operation.
Initial stationary jam PS25/
PS26/
PS27/
PS28
When an original is detected in the feed path during
pickup of the first original.
Pickup NG jam PS30 When original pickup operation starts with no original
set on the original pickup tray.
Timing error jam - When the original feed sequence is not completed
during the specified time.
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