(5) Check the ceiling tiles. If the ceiling is suspended, light can leak in from
the surrounding rooms.
(6) Check the position of the heating duct. Ensure that loaded cassettes are
not placed near the ducts because that will cause fog on the film.
7-21. EVALUATION AND INTERPRETATION
a. Make a note of the areas where there are light leaks.
b. Eliminate the light leaks from the darkroom.
7-22. PREVENTIVE MAINTENANCE
a. Perform this test every six months.
b. Perform this test when fog interferes with image quality.
7-23. CORRECTIVE MAINTENANCE
Initiate work orders to correct any light leaks in the darkroom.