L1 subcode 00

L1-00 indicates feeding is not completed
within the specified time after starting feeding.
(The scan head locking switch is locked)

The white area and the black marking on the shading plate are used to obtain the difference in the CCD level values for judgment of lock. When the difference in the levels of which and black is small, it is judged that the black mark could not be scanned by lock and the trouble code “L1” is displayed.