Lens Assembly; Operation - Sony DSC-S75 Training Manual

8. DSC-S75 and DSC-S85 Lens Assembly
Chapter 8 - DSC-S75 and DSC-S85 Lens Assembly
The lens assembly is replaced as a module. Since it is not disassembled by the technician, its internal mecha-
nism will not be discussed.
The "electronics" associated with the lens consist of a focus motor, aperture (iris) servo-motor, zoom motor and
end position sensors for the zoom and focus lenses. The electrical components, including the motors, are buried
inside the lens barrel and are not accessible.

Operation

1. Each of the three lens motors is driven by four pulsed dc lines.
2. Motor direction is determined by the sequence that the lines are pulsed.
3. The zoom and focus lenses have end sensors that determine the physical end positions of these lenses
during initialization.
4. The iris motor operates as a servo motor and is controlled by the light level falling on the CCD imager.
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