Ricoh FT6645 Manual page 58

23 April 1993
3.3 VERTICAL LENS DRIVE
[A]
HP (100%)
Enlarge
30 30 30
The lens vertical drive motor [A] changes the lens vertical position in
accordance with the selected reproduction ratio.
A stepping motor (approx. 0.095 mm/step) is used to drive the lens through
the lens drive belt. The maximum lens vertical shift distance is 290 mm (from
the position at 50% to the position at 200%).
The lens vertical home position sensor [B] detects the lens vertical position
for full size mode. The optic control PCB keeps track of the lens position
based on the number of pulses sent to the lens vertical drive motor.
Reduce
(Enlarge → HP)
(Reduce → HP)
(Enlarge → Enlarge)
(Reduce → Reduce)
(Enlarge → Reduce)
(Reduce → Enlarge)
30 steps
2-33
OPTICS
[B]