Polaroid Joshua Vision Service Manual page 52

The Latch is rotated by a combination of the Recock Latch Spring and the drag of the spring clutch in the
overrunning direction. As the Recock Latch rotates clockwise, it pulls the Blind down through the
Viewfinder Blind Link, uncovering the Viewfinder Window.
The Timing Gear has now rotated to a position where its DKEC cam releases the Outer Door Stop Link,
opening the DKEC switch. This signals the micro to open the shutter blades. The Outer Door Stop Link is
cammed up again, closing the DKEC switch.
The sequence of DKEC switch actuations by the Timing Gear cam can be seen in Figure 2-26. At the
beginning of a cycle, the Timing Gear cams the Door Stop Link to close the switch.
Half-way through the cycle, the Door Stop Link momentarily opens and then recloses the switch (as
described above), signalling that the mirror is down. This mirror down signal lets the electronics know that
the Viewfinder Blind can be opened, so that with the shutter blades reopened, the Viewfinder does not
remain dark.
At the end of the cycle, the DKEC switch opens again, shutting off the motor.
Figure 2-26. DKEC Switch Actuations by Timing Gear During Normal Cycle
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