Jam Detection - Canon imageRUNNER 1750 Series Service Manual

2
Technical Explanation > Original Exposure and Feed System > Control of ADF > Jam Detection

■ 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.
PS30
PS25
PS28
PS27
PS26
PS23
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)
2 Technical Explanation > Original Exposure and Feed System > Control of ADF > Jam Detection
Jam type
Registration sensor delay jam
Registration sensor stationary
jam
Lead sensor delay jam
Lead sensor stationary jam
Stay sensor delay jam
Stay sensor stationary jam
Reversal sensor delay jam
Reversal sensor stationary jam
ADF open jam
Initial stationary jam
Pickup NG jam
Timing error jam
F-2-43
Sensor Jam description
PS26 When the registration sensor cannot detect an
original within the specified time.
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.
PS25 When the lead sensor cannot detect the original
within the specified time.
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.
PS27 When the stay sensor cannot detect the original
within the specified time.
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.
PS28 When the reversal sensor cannot detect the original
within the specified time.
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.
PS23 When the ADF is opened during its operation.
PS25/ When an original is detected in the feed path during
PS26/ pickup of the first original.
PS27/
PS28
PS30 When original pickup operation starts with no original
set on the original pickup tray.
- When the original feed sequence is not completed
during the specified time.
2-25
T-2-12
2-25