Powering Camera When Film Door Is Closed, Latched And Then Erected - Polaroid Joshua Vision Service Manual

Powering Camera when Film Door is Closed, latched and then Erected

As shown in Figure 2-8, a cam surface on the Door Latch engages the end of the Door Latch Sensor.
Closing and latching the Door pivots the Sensor CCW, allowing the B+ wire to drop, but not far enough to
contact VER when the camera is in the folded position. (The important effect on the power circuit of
latching the Door, as contrasted to simply closing the Door, is discussed below.)
Figure 2-8. Effect of Door Latch on B+ Wire of Power Switch
With the Door closed and latched (the B+ wire down), erecting the camera now causes the Erect Link to
pivot the Erect Sensor clockwise, lifting VER. This movement of VER first breaks the VER to GND
contact, then makes the VER to B+ contact (Figure 2-9).
Figure 2-9. Effect of Erect Link on VER Wire of Power Switch
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