Recording Paper Jam Detection Configuration; Pick-Up Delay Jam; Pick-Up Stationary Jam; Delivery Delay Jam - Canon PC-D320 Service Manual

PC-D320/PC-D340/FAX-L400 Chapter 2: Technical Reference

3.2 Recording Paper Jam Detection Configuration

The following paper sensors are installed to detect paper presence and paper feed condition.
• Page top sensor
• Paper eject sensor
The CPU on the ECNT board determines a paper jam by checking whether or not paper is
present on the sensor at the timing stored in the CPU.
When the CPU judges a paper jam, it stops print operation and notifies the jam.

3.2.1 Pick-up delay jam

This machine performs retry control to redress the pick-up delay jam caused by pick-up error.
In this control, a pick-up operation is conducted a maximum of twice.
If the page top sensor cannot detect the leading edge of the paper within 1.4 seconds after the
pick-up solenoid is turned ON in the first pick-up operation, the CPU tries another pick-up
operation, the CPU determines a pick-up delay jam.

3.2.2 Pick-up stationary jam

If the page top sensor cannot detect the trailing edge of the paper within 4.6 seconds after
detecting the leading edge, the CPU determines a pick-up stationary jam.

3.2.3 Delivery delay jam

If the leading edge of the paper cannot reach the paper eject sensor within 2.1 seconds after
the page top sensor detects the edge, the CPU determines a delivery delay jam.

3.2.4 Wrapping jam

The CPU determines a wrapping jam under both the following two conditions:
• 10 seconds passed after the paper eject sensor detected the leading edge of the paper
• The paper eject sensor cannot detect the trailing edge within 1.5 seconds after the page
top sensor detected the leading edge.
In case of judging a wrapping jam, the CPU notifies the jam as a delivery
stationary jam.
NOTE

3.2.5 Delivery stationary jam

If the paper eject sensor cannot detect the leading edge of the paper within 2.2 seconds after
the page top sensor detected the trailing edge, the CPU determines a delivery stationary
jam.

3.2.6 Residual paper jam

During the initial rotation period, if the page top sensor or paper eject sensor detects the
paper, the CPU determines a residual jam.
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