Slide Scanner Repair Manual
Diagnostics and Troubleshooting
155
Uncorrected Dark Uniformity Test
The dark portion of the test is based on the offset uniformity profile of the slide scanner. The
dark performance of the CCD is tightly specified and tested due to the limited correction range
of the SprintScan 35ES. If the uncorrected signal (Figure 5-20) exceeds the scanner’s
correction range, streaks will develop in dark signal.
The Mean Uncorrected Dark Level is the mean response of the CCD in the dark, as
measured in digital numbers in terms of the LSB’s of the A/D converter. Thus the result is on
a 10-bit scale for the SS35ES and a 12-bit scale for the SS35 Plus. In either case, it is
checked to be no more than a specified amount above the uncorrected calibration target. For
the SS35ES, that target is 16 digital numbers (dn) and for the SS35 Plus, it is 68dn.
Note:
The CCD signal has received analog offset adjustment to properly place the
sensor’s dark reference pixels.
The Uncorrected Dark Standard Deviation checks the standard deviation of the uncorrected
dark profile response of a scan of the black calibration target. The stand-alone test also
reports the uncorrected dark profile minimum maximum-minimum to fill out the statistical
analysis. The min and max-min data is reported only and is not tested against constraints.
Failure of either of these tests is generally caused by:
•
Light leakage (flare) on the back of the black calibration portion of the film carriage.
•
Poor placement of the light tunnel.
•
A bad CCD.
Figure 5-20. Uncorrected dark uniformity profile
Bad Pixel Flag
The Bad Pixel Flag count is reported for information only to track the number of pixels
that the internal calibration algorithm’s have flagged for replacement. It is the metric of the
general condition of the CCD’s only. The presence or absence of this count will generally
change from scan to scan and should not affect the quality of the output to the customer.
Содержание SprintScan SS35
Страница 9: ...Slide Scanner Repair Manual Scanner Overview 9 1 Scanner Overview...
Страница 31: ...Slide Scanner Repair Manual FunctionalDescription 31 2 Functional Description...
Страница 50: ...50 Slide Scanner Repair Manual Calibration and Adjustments 3 Calibration and Adjustments...
Страница 72: ...72 Slide Scanner Repair Manual Parts Replacement 4 Parts Replacement...
Страница 96: ...96 SlideScannerRepairManual Diagnostics and Troubleshooting 5 Diagnostics and Troubleshooting...
Страница 157: ...157 Slide Scanner Repair Manual System Diagrams 6 System Diagrams...
Страница 159: ...159 Slide Scanner Repair Manual System Diagrams Power Supply Specification Sheet 1 of 4...
Страница 160: ...160 Slide Scanner Repair Manual System Diagrams Power Supply Specification Sheet 2 of 4...
Страница 161: ...161 Slide Scanner Repair Manual System Diagrams Power Supply Specification Sheet 3 of 4...
Страница 162: ...162 Slide Scanner Repair Manual System Diagrams Power Supply Specification Sheet 4 of 4...
Страница 163: ...163 Slide Scanner Repair Manual System Diagrams AC Inverter PC Board...
Страница 164: ...164 Slide Scanner Repair Manual System Diagrams Image Sensor CCD PC Board Sheet 1 of 3...
Страница 165: ...165 Slide Scanner Repair Manual System Diagrams Image Sensor CCD PC Board Sheet 2 of 3...
Страница 166: ...166 Slide Scanner Repair Manual System Diagrams Image Sensor CCD PC Board Sheet 3 of 3...
Страница 167: ...167 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 1 of 8...
Страница 168: ...168 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 2 of 8...
Страница 169: ...169 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 3 of 8...
Страница 170: ...170 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 4 of 8...
Страница 171: ...171 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 5 of 8...
Страница 172: ...172 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 6 of 8...
Страница 173: ...173 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 7 of 8...
Страница 174: ...174 Slide Scanner Repair Manual System Diagrams SS35 SS35 ES Main Controller PC Board Sheet 8 of 8...
Страница 175: ...175 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 1 of 9...
Страница 176: ...176 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 2 of 9...
Страница 177: ...177 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 3 of 9...
Страница 178: ...178 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 4 of 9...
Страница 179: ...179 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 5 of 9...
Страница 180: ...180 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 6 of 9...
Страница 181: ...181 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 7 of 9...
Страница 182: ...182 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 8 of 9...
Страница 183: ...183 Slide Scanner Repair Manual System Diagrams SS35 PLUS Main Controller PC Board Sheet 9 of 9...
Страница 184: ...Slide Scanner Repair Manual Appendix 184 Appendix...
Страница 185: ...Slide Scanner Repair Manual Appendix 185 Appendix Contents SS35 35ES Firmware Hardware Update History 186...