Konica Minolta REGIUS 190, Service Manual

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4.3 Troubleshooting for Image Quality
REGIUS MODEL 190 Service Manual Ver.1.00 2004.11.01
4.3 Troubleshooting for Image Quality
In this paragraph, remedies for image quality troubles as listed below are described.
Horizontal stripes, vertical stripes, S-value variation, poor contrast, irregular L/R brightness, dose abnormalities,
image disparity, white blotches, black blotches, monitor display errors (OK for fi lm), image duplication.
4.3.1 Flow of Troubleshooting
•
For each of the following cases, carry out investigation of causes in sequence from Step 1, and take an appro-
priate action. If the problem is not resolved by any action, please report the corresponding details to the man-
ufacuturer(i.e., quality assurance).
•
Similarly, for cases which are not included in the following description, please report the corresponding details
to the manufacturer (i.e., quality assurance).
•
After replacement of the optical unit, carry out PLL adjustment, side start-point adjustment, uniformity calibra-
tion, and sensitivity calibration.
4.3.2 Case 1: Entire image is too dark (with subject structure)
Cause Remedy
1
The output density of the G-processing parameters
is too high overall. Set the H/L brightness setting of the G-processing
parameters to a lower value.
(For more details, refer to the Image Processing
Adjustment Manual)
2
The X-ray dose is too high (for FIX processing and
non-processed images) Review the exposure conditions to determine
whether the X-ray dose is appropriate.
3
S value (i.e., gain) setting of the REGIUS Console
is too high (for FIX processing and non-processed
images) Correct the S value setting to a suitable level.
4
Failure in sensitivity correction (for FIX processing
and non-processed images) Review the sensitivity correction.
5
For some reason, the ROI identi fi ed for processing
is not correctly set.
Correct the ROI setting to the appropriate position.