Davin J012, Service Manual

Page: 325 / 365

• The 1st registration sensor detects the leading edge of the sheet [3] for feed timing.
• The 1st registration sensor also detects the width of the paper when it passes over and detects the left
vertical edge of the paper. This ensures that the paper below is wide enough for the maximum printing
area specified by the paper size selection for the print job.
Paper Jam, Trailing Edge Detection
The feeler [1] is pushed down by every sheet of paper that arrives and then pops up again when the trailing
edge of the sheet passes over the feeler. When the paper presses down the feeler, this turns on the trailing
edge sensor [2]. The length of time the trailing edge sensor remains on is used to measure the length of the
paper for printing control.
A paper jam alert occurs when:
• The paper feed roller rotates forward twice.
• The trailing edge sensor does not go on after 2 rotations of the paper feed roller.
Paper Transport Drive
6. Detailed Section Descriptions
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