GRAPHTEC FC2250 Service Manual page 78

How to reinstall the registration mark sensor
(1) Reattach the registration mark sensor in the reverse order in which it was detached.
(2) The each sensor has installing direction, install them to the correct location when installing them.
(The right side sensor direction is horizontal, and the left side sensor direction is vertical.)
(3) Adjust the registration mark sensor sensitivity and the offset of the registration mark sensor by the
electrical adjustment.
FC2250-UM-251-9370
7. DISASSEMBLY AND ADJUSTMENT
7-30