Polaroid Joshua Captiva, Service Manual

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A - 9
Track & Hold System Exposure determination and control system developed for Joshua Camera,
using high IC switching speeds and implemented in chip design. Ambient
and strobe contributions are determined in advance, strobe is fired at smallest
practical aperture, ambient integration continued until exposure is complete.
Trap End Film frame end opposite to pod end.
Two-Zone Focus System In Joshua, consists of 0.6 to 2.4 m and 2.4 m to infinity. Near zone uses
Main Lens system only, far zone adds Far Focus Lens.
VER, Ver Erect Voltage line; when closed to B+, camera is powered.
VF Abbreviation for viewfinder.
Viewfinder Blind Pivoted mask which covers Viewfinder window during exposure, preventing
entrance of stray light.
Viewfinder Mirror Concave mirror which redirects image from Fixed Mirror to Eyelens.
Visible Integrator Electronic summing circuit for visible (ambient) light measurements by
Photometer.
Walking Beam Pivoted arm in Shutter System which couples Solenoid 1 to Blades, closing
them when Solenoid is energized. (Blades are normally open, under spring
load).
Wake-Up Mode Camera cycle initiation at full operating voltage, triggered by . . . (reset
signal? from microprocessor?).
Wink Pre-exposure discharge of about 10% of strobe energy and measurement of
reflected IR.
Wink Aperture Prediction of smallest possible practical aperture for strobe fire (and thus
Priority System maximum depth of field), based on Wink strobe fire and measurement.
Primary purpose of Wink is aperture prediction; also determines if Far Focus
Lens is needed.
Wireform Switch Design used for Power and Logic Switches; flexible wires mounted in
molded switchblock contact a common ground plane when deflected by
manually or drive-pivoted arms.
Wrap-Spring Clutch See Clutch, Wrap Spring.