Hologic DISCOVERY A, Technical Manual

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Discovery QDR Series Technical Manual
6-9
6.10 Area/BMD/BMC/CV Specification Problems
6.11 X-Ray Problems
The following lists some common X-ray problems and some suggested solutions. Refer to
Section Two Functional Description for more information on the X-Ray subsystem.
6.11.1 No X-Rays
6.12 X-Ray Alignment Problems
6.12.1 X-Ray beam does not align properly
If the X-ray beam does not align properly per the procedure, follow these suggestions.
1. Try to align the X-ray beam to the drop-off points per the alignment procedure.
Recheck the position of aperture 10 with the alignment block and pin. If the
If... Possible cause Refer to...
X-ray beam
misaligned X-ray beam alignment on aperture 7. Signal output level should
not rise or fall by a significant margin. page 4-4
X-ray beam
quality problems Measure X-ray peak potential and tube current waveforms.
Make sure they are both stable and within specs.
Check X-Ray Survey bar graph for shifting or “dancing” X-rays.
If so, test X-Ray Controller.
Check A/C line for stability (voltage and frequency). Page 3-30,
Page 4-4
Mechanical frame
problems Check motor drive belts for excessive play.
Ensure all hardware on the arm, frame, and drives are secure and
clear of moving assemblies (C-arm, etc.) Page7-1
Mechanical motor
drive problems Check for loose assemblies: Detector Assembly
X-ray Tank
X-ray Controller
Aperture Assembly Figure 5-8
Figure 5-6
Figure 5-18
Figure 5-18
The bone and/or tissue segments in the filter drum may be
defective or out of spec. If so, replace and restart system testing. Figure 5-18
through
Figure 5-24
If... Check... Refer to...
X-Ray (24VDC LED) on
Distribution Board is not lit X-ray Enable LED on Control Panel and
Distribution Board should be on
“NO A/C Line Interrupts”
message at start-up Interlock inhibit
24VDC from LVPS, power distribution
X-ray Controller interlock switch
Computer problems (CommCon)
Defective Control Panel I/F
XRC Power Cable/Connector problems Figure 5-1,
Figure 5-2.
Figure 5-14.
Figure 5-16