Universal Radiographic System
Service Manual
SM-0524R4
29
7. Do not remove the Collimator Test Tool from its original position and
adjust the Light Field by moving the Collimator Unit and/or the Collimator
Lamp.
a. Collimator Lamp must be ON during Light Field adjustment.
b. Modify Collimator position by carefully unscrewing and screwing
the four Centering Adjustment and Safety Screws (Allen) until the
Light Field coincides with the axes reference imaged (numbers
and dots) on the processed film.
Illustration 4 -9
Collimator Screws
CENTERING ADJUSTMENT AND SAFETY SCREWS
c. If adjustment is still necessary, modify position of Collimator Lamp
(refer to Collimator Manual).
8. Repeat exposure and procedure until the result is satisfactory. The
maximum misalignment allowed is 2 % of SID (for SID 1m = 2 cm of
tolerance).
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