Canon CXDI-80C Service Manual page 156

[ Notes on use of a photo timer]
Using a photo timer with a stand mounting, etc., may effect the performance test and cause an
error, depending on the type and mounting configuration of the photo timer. The following may
be to blame for these errors.
• An image of the photo timer may be captured due to geometrical misalignment of the X-ray
generator during calibration.
• The mounting fixture of the photo timer or wires extending from it may be captured in the
calibration image, resulting in a low S/N determination for those portions only.
* Extraneous images, as described above, were captured by conventional SF systems as well, but
the characteristics of the film were such that these images were not visible. Therefore, there is
no problem with the sensor itself. If this kind of error has occurred, the calibration images,
performance test images and also the self-diagnosis images taken at the time concerned must
also be checked.
If the error persists after all of the above checks have been completed, check the following and
then contact Canon Inc.
• Confirm that the phantom image, etc., appears in film or the output of a high-resolution monitor
when images are processed in the normal manner, and clarify whether or not artifacts are being
observed. For example, artifacts can manifest themselves as vertical or horizontal lines, or as
rectangular granularity that obscures a portion of the sensor field.
[Self-diagnosis]
The self-diagnostic test function includes Test A device check, Test B test pattern check (which
corresponds to the former Test 2), and Test E offset correction test (which corresponds to the
former Test 5).
• This must be carried out after checking that the system is operating normally after installation.
• Self-diagnosis imaging for checking the conditions resulting after a system has been newly
installed and after the photo timer adjustments have been carried out must be implemented.
When this is done, the resulting files must be taken back together with the files produced from
the performance test imaging and stored in a safe place.
* Recording of performance test or self-diagnostic test files can be enabled by starting Collection
Tool from among the service tools, selecting the [QC result] category, and checking the desired
items on the QC history list.
[Precautions when errors have occurred]
Test B: If errors have been detected in connection with the test pattern inspection
• When this error occurs, it is possible that the PCA-FE2 board in the detector is not properly
generating a test image or there may be a fault in the image data communication channel.
* Malfunction of PCB (PCA-FE2 board) inside the detector
* Problem in detector cable connection or a broken wire (with a wired connection)
Test E: If errors have been detected in connection with the offset image inspection
• Detector panel trouble or extraneous noise may be to blame.
* If errors have been detected, the calibration images, performance test images and also the
self-diagnosis images taken at the time concerned must also be checked.
If there are many abnormal or defective pixels in the self-diagnosis images, investigate how this
came about.
In the case of extraneous noise, change the position of the detector, and check for changes in the
extent of the resulting effect and the sources of the noise.
If the error persists, the following must be checked, and then Canon Inc. must be contacted.
6. Troubleshooting
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