Polaroid Land SX-70 User Manual page 10

When the release button is pressed, a switch
S1 closes (Figure 1-11 A and B) and applies
operating power to the shutter. As soon as power
is applied to the shutter, solenoid #1 is energized
and rapidly moves the shutter blades to the
closed position.
Figure 1-11 A Location & Arrangement of internal parts
Figure 1-11 B Operation
When the solenoid has reached the end of its
stroke (shutter closed, it no longer requires
maximum current to hold it at that postion.
Switch S4 (located on solenoid #1) closes (CB)
and activates an electronic circuit called the
POWER DOWN CIRCUIT. This reduces power