Repair manual

2-8
THEORY OF OPERATION
B. Exposure System
The Exposure System (Figure 2-1) consists of a camera (back) adapter assembly. a filter
wheel assembly, a filter wheel photo interrupter (position sensor), a filter wheel stepper
motor, an auto luminance photodiode assembly (brightness sensor), and a CRT display
assembly.
1. Component Description
a. Camera (Back) Adapter Assembly
Four Polaroid camera back assemblies can be used with the Digital
Palette. They are:
o 35mm Camera Back (Auto load, advance, and rewind camera back
with high resolution lens);
o Autofilm Camera Back (All Polaroid Autofilms);
o Pack Film Camera Back (All Polaroid 3 1/4 x 4 1/4 pack films);
o 4 x 5 Film Camera Back (All Polaroid 4 x 5 films).
Developed specifically for the Digital Palette by Polaroid, each camera
back has its own lens. Focus and aperture are fixed; exposure is
controlled by the Digital Palette.
Figure 2-1. Exposure System
Auto Luminance
Photodiode
Photo
Interrupter
Stepper Motor
Turns Filter Wheel
CRT
35 mm
Camera
Adapter
Lens