9600 Service Manual - gmecorp-usa.com

Image System Calibration 29
VARIABLE COLLIMATOR CENTERING
WARNING... Steps within this procedure produce X-rays. Use appropriate precautions.
1. Select the NORMAL field size
2. Reinstall the Bore Sight Tool.
3. Take an exposure to determine whether the Variable Collimator requires
adjustment. The bore sight should appear centered on the image.
4. If the Variable Collimator does not require adjustment continue to the next section
"Collimator Iris Calibration" Otherwise, perform the following:
A. Loosen the 4 collimator mounting screws, shown previously in Figure 19, by
turning them approximately 1/8 of a turn CCW.
B. While making an exposure, adjust the collimator positioning plate with the X and
Y adjustment screws and center the X-ray beam in the Beam Alignment Tool
pattern as shown in Figure 28.
Figure 28 - Positioning the Variable Collimator
C. Tighten the collimator anchor screws (two with large flat washers) and then verify
alignment with another exposure.
D. Tighten the remaining collimator screws and remove the Bore Sight Tool.
5. Reinstall the secondary filter on the collimator using the four washers and nuts.