Ricoh FT5540 Service Manual page 62

31 August 1989
Home position is checked by moving
the lens from the enlargement side
towards the reduction side. So, when
home position is checked, a LOW to
HIGH to LOW signal is present at
CN305-9 of the optics board. This
occurs when the actuator blade enters
and exits the lens home position
sensor. The lens only references home
position when going to full size (at
power up, when modes are cleared,
when full size is selected.) The lens
always overshoots the selected
magnification ratio position by 40 steps
to eliminate mechanical play when
going from enlargement to reduction.
2-14