3. Model 636 Ambient Exposure Adjustment
a. Remove the Front Plate/Lens Panel (see Fig. 3) and replace it with the modified Front
Plate shown in Fig. 5 (NPI 600AM #92-30 has more information).
b. Using a dental pick, narrow-bladed screwdriver or other suitable tool, adjust the
ambient calibration disc (see Fig. 7). Move the ambient calibration disc clockwise
(CW) to decrease the reading or counterclockwise (CCW) to increase the reading
(see Fig. 7).
c. Replace the original Front Plate and retest the camera. Readjust the ambient
calibration disc if necessary.
d. If the ambient calibration disc adjustment cannot bring the reading into specification,
disassemble the camera down to the shutter level and examine the photocell area. Be
certain the photocell is properly seated. Reassemble the camera and retest. Readjust
the ambient calibration disc if necessary.
Fig. 7 Adjusting the Ambient Calibration Disc
Ambient
calibration disc
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