Troubleshooting
Preva
74
Light or Dark
X-ray Images
1. Adjust the selected exposure time, kilovoltage or tube current to produce an
acceptable image. If necessary, reprogram the techniques factors, as
explained in the System Configuration section of this manual.
2. Verify the kilovoltage and tube current during an exposure using the
diagnostic mode, as explained in the System Configuration section of this
manual. Alternatively, you may employ a non-invasive meter to evaluate
kilovoltage and exposure time.
3. Inspect the condition of the remaining imaging chain components such as
the film, chemistry and processor, or the condition of the X-ray sensor and
computer.
4. Check for pulsing output with fluorescent screen. If this is occurring, replace
the Logic Board.
5. Light image can be caused by the Logic Board. This is characterized by a
short pulse of exposure as viewed with a fluorescent screen. Replace the
Logic Board.
6. Full fluorescence with light image may require adjustment of the
preprogrammed techniques.
At Power up, the
Operator Display
Stops at “Preva”
Replace the operator display board.
At Power Up,
Continuous Beep,
Backlit Display, No
Display
Characters, No
Ready Light,
Power Supplies
OK
Replace the Operator Display Board [30-08054] or the Logic Board [30-08160],
or both.
At Power Up,
Continuous Beep
with Normal
Display
Replace the Logic Board [30-08160].
At Power Up,
Buzzing Noise is
Heard
Replace the Logic Board [30-08160].
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