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Model 636 Ambient Exposure This test measure the energy on the film plane during an ambient exposure at 100 cd/sq ft scene brightness.

NOTE: The following test assumes the camera is on the horn, against the light source.



1. Turn the test selector switch

to 600 EXPOSURE.

Selector to 600 EXPOSURE

2. Flip mode switch to EXPOSURE.

3. Set the light source selector

4. With the photocell uncovered, press S1 only.

2. Mode switch to EXPOSURE

3. Light source to 100 cd/sf to 100 cd/sq ft

4. Press S1

5. When exposure is made, record the reading shown on the Relative Error in Stops meter. Compare reading to specification.

6. Repeat steps 4 and 5 two more times to insure accurate reading.

7. If the reading is not within specification, refer to


5. Compare reading to spec.

6. Repeat 4 & 5 twice.

7. If out of spec, see Adjustments.

C. Model 636 Camera Adjustments (to correct out-of-spec test results)

This section describes adjustments which can be made to correct readings which are out-of-specification on the B-600 Tester. Refer to the latest Specification Chart to determine acceptable readings for each of the tests listed below.

The Camera Adjustments which follow are listed in the same order as the Test Procedures: Flash Timing Aperture Flash Exposure Ambient Exposure

Fig. 3 Removing Front Plate/Lens Panel

Fig. 4 Adjusting Opening Blade Spring

a. Remove the Front Plate/Lens Panel from the apron (Fig. 3).

b. Using tweezers, grasp the end of the opening blade spring.

c. Move the opening blade spring up in the rack to increase the reading or down in the rack to decrease the reading (Fig. 4).

d. Reassemble and retest the camera. Readjust the opening blade spring if necessary.

e. If the adjustment cannot bring the reading into specification, replace the opening blade spring and repeat step c.

f.If the reading is still out-of-specification,disassemble the camera to the shutter level.

Examine the shutter area for loose or misplaced parts, binding blades, etc. Correct any problems found and reassemble and retest thecamera. Readjust the opening blade spring if necessary.