Film Processing And Cycle Advance - Polaroid ProCam Repair Manual

The Solenoid pulls the Drive Link and rotates the Walking Beam clockwise to its
original position, closing the Shutter Blades. Solenoid 2, which has been at a
holding current level during the exposure, is now de-energized. This disengages
the Catch Pawl from the Quintic and allows the Quintic return spring to bring the
lens back to its original position. The foot of the Catch Pawl is also now posi-
tioned to latch the Walking Beam. Thus when Solenoid 1 is de-energized, the
Walking Beam cannot move. The exposure cycle is now completed.
Strobe recharging begins immediately after the Shutter System is latched, in the
form of a brief sneak charge. Before the film frame is processed, the sneak charge
acts to top off the flash capacitor, either fully recharging it or partially recharging
it. (This depends on how much Strobe energy was expended during the exposure).
The purpose of the sneak charge is to minimize the time required to charge the
strobe before the next exposure is made. The sneak charge ends when the Shutter
Button is released.
SOLENOID 2
DRIVE LINK
SOLENOID 1
Figure 1-33. Shutter Components at End of Exposure Cycle

Film Processing and Cycle Advance

Motor drive starts when the Shutter Button (S10/S1) is released. The Motor
drives the Timing Gear the same way as described for the dark slide cycle. The
Timing Gear closes EOC/S9 to keep the Motor running and pulls the Pick Slide
forward (Figures 1-34 and 1-35).
CATCH PAWL
1 - 30
QUINTIC RETURN
SPRING