Figure 4-5. The Alignment Fixture Properly Installed; Figure 4-6. Filter Drum Adjustments - Top View - Hologic QDR 4500 Technical Manual

Figure 4-5. The Alignment Fixture Properly Installed

7. Exit SQDRIVER.
8. Set the machine in the Center Table position, then raise the table all the way up.

Figure 4-6. Filter Drum Adjustments - Top View

9. At the Filter Drum assembly, loosen the jam nuts, and insert Allen wrenches (3/32"), in
both Filter Drum Allen alignment screws. (Figure 4-6 above shows location of
alignment screws and jam nuts.) Ensure that the Filter Drum is running.
10. Type SUSQ <Enter>, set high gain = 2, low gain = 1. Set X-ray mode to 3.
11. Press <Ctrl> <Pg Dn> to get the bar graph.
12. Verify that the screen shows Pulse 1 (high air). If it doesn't, press <Alt><P> until it
does.
13. Set X-ray mode to 3, press <Ctrl><PageDown> and make sure the screen still shows
pulse 1.
14. Press F1 to turn on X-rays. View the X-ray plot.
4-6
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QDR 4500 Technical Manual
FRONT
Adjusting
Screws and
Jam Nuts
Filter Drum Base
Assembly (filter drum
assembly removed)