Exposure Mode Selection - Polaroid Miniportrait 455 Repair Manual

Exposure Mode Selection

1. As the motor runs, cam (B) at the end of the gear train (bottom of Figure. 2-5) rotates
disc (A) counterclockwise one-quarter of a turn. The mode blade (a) also rotates
counterclockwise.
2. Spring (a') links the M blade (a) to disk (A), and spring (b') links the MS blade (b) to
disc (A), turning these blades in the direction shown by the arrows. The M blade (a)
and MS blade (b) cover the exposure windows in the shutter blade, according to their
respective exposure modes.
Figure 2-5. M & MS blade rotation during mode selection
(Figures 2-5 through 2-7)
S4 Switch
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