Discovery QDR Series Technical Manual
6-7
6.7.3 Noise
The term "noise" is used here to describe any flaw, or irregularity in the display (dots,
specks, uneven lines, etc.) or similar problem. The following suggestions apply to a
Discovery system that exhibits noise in the display:
6.7.4 No Display
The term "no display" is used here to describe:
• no scan display
• completely white screen
• completely dark screen
• “blotchy” or “grainy” display
This type of display problem is usually related to the detector subsystem or the X-ray
subsystem.
The following suggestions apply to a Discovery system that exhibits no scan display:
Check... Refer to...
Tube kV peak potential see “Check Tube kV Peak Potential” on page 3-28
Tube current see “Check Tube Current ” on page 3-30
X-ray beam alignment see “X-Ray Beam Alignment ” on page 4-4
Signal strength and noise see “X-Ray Survey” on page 9-1
Aperture position and aperture belt see “Aperture Calibration ” on page 4-9
Filter Drum is turning Figure 5-16
Filter Drum belt Figure 5-21
Green LED’s on C-Arm Interface board Figure 5-7, Section 8
Aperture plate assembly, first
precollimator, second precollimator and
collimator for specs of lead and other
deformities.
Figure 5-17
Also...
Run the hardware checker see “SQVERIFY” on page 9-10
Check... Refer to...
Tube kV peak potential see “Check Tube kV Peak Potential” on page 3-28
Tube current see “Check Tube Current ” on page 3-30
X-ray production see “Field Service Preventive Maintenance” on page 7-1
Signal strength and noise see “X-Ray Survey” on page 9-1
Filter Drum is turning Figure 5-6, Figure 5-18 through Figure 5-23
Filter Drum belt Figure 5-18, Figure 5-23
Green LED’s on C-Arm Interface board Figure 5-6, Section 8
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