Strobe Exposure Calibration - Polaroid Joshua Vision Service Manual

Strobe Exposure Calibration

Setup (Figure 3-3)
1. Open the camera door .
2. Using a solder aid tool, manually trip the camera door switch into its down position.
3. Using a solder aid tool, remove the front cover from the camera.
4. Install the Joshua Test Cover in place of the removed front cover.
5. Set the Joshua Test Cover Strobe/Ambient (STB/AMB) switch to its Strobe (STB) position.
6. Place the camera with the Joshua Test Cover onto the Joshua Horn Assembly.
7. Place the Joshua Horn Assembly on top of the Star Tester (Figure 3-5).
8. Center the Joshua Horn Assembly on the Star Tester with respect to the Graywall. The camera
lens must be 4.5 feet (137 cm) from the Graywall.
Note: The front of the camera must be parallel to the Graywall and the area visible in its
viewfinder must be free of all objects.
9. Set switch 1 (SW 1) of the Joshua Horn Assembly to its Strobe (STB) position.
10. Slide the camera trim switch to its center (normal) position.
11. Set the Star Tester selector switch to its Flash position.
AdjustmentProcedure
1. Press the camera shutter button.
2. Record readings shown on the STOP ERROR display of the Star Tester.
3. Repeat steps 1 and 2 two more times, recording all reading shown on the STOP ERROR display of
the Star Tester. (Because of the SLR system there is only one reading for every two cycles of the
camera.)
Note: Strobe Specification Limits -.10 + 0.25 STOP
3 - 12