Ricoh FT5540 Service Manual page 61

[A] - Lens Drive Pulley
[B] - Lens Housing
The lens home position sensor [C] informs the optics PCB when the lens [D] is at the full-size
position (home position). The optics PCB determines the lens stop position in reduction and
enlargement modes by counting the number of steps from the home position. When the
reproduction ratio is changed, the lens moves directly to the selected magnification position.
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31 August 1989