Polaroid Joshua Captiva, Service Manual

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This rotates the Inner Door Stop Link far enough to be caught by the Pick Carrier, which acts as a detent.
Rotation of the Inner Door Stop Link also rotates the Outer Door Stop Link, closing the DKEC switch.
Closing the Film Door rotates the Door Stop back up, but the Door Stop Links remain in their detented
position.
When the micro senses the DKEC closed at the beginning of a cycle (power up), it interprets this as a do a
darkslide command and causes the camera to automatically go through a normal processing cycle (no
motor reverse or mirror release). This is an important action for mid-cycle clearing. The Inner Door Stop
Link is released when the Pick Carrier is driven forward, but the DKEC Switch remains closed. (The
Timing Gear has rotated far enough to prevent the Outer Door Stop Link from dropping.)
The camera then acts as it would in a normal cycle.
Folding the Camera during a Processing Cycle
The cycle will end on the return of the Pick (so-called maintaining power).
When the Camera is erected the next time, the DKEC Switch will still be closed and the motor will run
forward very briefly. It will stop very soon, when the Outer Door Stop Link drops off its Timing Gear cam
and opens the DKEC Switch, bringing the system to its normal stopping point. This brief motor run is
referred to as a hiccup.
System Schematic
Figure 2-31 shows the Circuit Diagram for the Joshua Camera.