Hologic DISCOVERY A, Technical Manual

Page: 185 / 274

Discovery QDR Series Technical Manual
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11. Remove the Filter Drum by lifting it up (while tilting it slightly forward) and out.
12. Replace the 3 hex head screws. Ensure that the curved spring washers are placed
(curved downward) so that the washer compresses when the screw is tightened.
13. Replace the cables.
14. Replace the screws in the XRC assembly.
15. Restore power, boot the computer and login as Service.
16. Perform “X-Ray Beam Alignment ” on page 4-4.
17. Perform “Aperture Calibration ” on page 4-9.
18. Perform “A/D Gain Control Adjustment” on page 4-26.
19. Replace all covers that were removed.
20. Perform “Detector Flattening ” on page 4-29.
5.6.4 Tank Assembly
To remove and replace the Tank Assembly, refer to Figure 5-7 and Figure 5-8 and follow
the procedure below:
1. Using the Control Panel, move the table in as far as it will go for easier access.
2. Start the X-Ray Survey Utility by selecting Utilities|Service Utilities|X-Ray
Survey (see “X-Ray Survey” on page 9-1 for information on the utility).
3. Set Aperture to 7.
4. Shut down the computer and then turn off the main circuit breaker on the foot end
pedestal.
5. Remove the lower C-arm cover by removing 2 Phillips screws and sliding it out
from the front.
6. Remove the XRC (see procedure above).
7. Remove the Filter Drum Assembly (see procedure above).
8. For A and SL models only: Lock the C-arm in place by securing the shipping
brackets on each side of the arm.
WARNING: Because of the weight of the tank (about 200lbs), 2 people are required to safely remove
and replace the tank.