Hologic DISCOVERY A, Technical Manual

Page: 223 / 274

Discovery QDR Series Technical Manual
6-11
8. If a failure occurs during a whole body, recheck the TX motor cal files. The X-
rays may be hitting the table edge. Make sure the drives are operating normally.
Examine the Detector Flattening scans for any unusual indications using
Utili-
ties|Scan File Plot
and selecting the WBAIRQC scan. If an error message is
displayed, go to “Detector Flattening ” on page 4-29.
6.14 Laser Problems
When troubleshooting the laser, refer to the following:
WARNING: The laser beam can cause serious retinal damage if focused directly into
the eye. Be sure to turn the laser OFF when visually inspecting the shutter
and aperture.
Make sure... Refer to...
Shutter is open and not obstructing the beam Page 5-29, Figure 5-14
Motor drives have been calibrated Pages 3-33 to 3-42
If... Suggestions
Laser does
not turn on
(Software is inhibiting laser when table head is near the laser)
Move the C-arm to the center of the table and retry.
Do the following:
1. Check black and yellow wires from the C-arm Interface PCB to the
underside of the Detector Assembly.
2. Shut off instrument power (Emergency Stop Switch on Control
Panel).
3. Disconnect laser power connector.
4. Connect a DVM to the plug coming from the Detector Assembly.
5. Turn laser power on.
6. Check connector for +5VDC.
Check C-arm Interface Board, Distribution Board, all cables.
Check computer.
At installation only, type “laser safety=0” in SQDRIVER and reboot.
Check AY motor calibration file. If data is corrupt or uncalibrated, laser may
not turn on, despite position of C-arm.