Fuji Xerox DocuCentre SC2020 Service Manual page 659

6.4.16.5 LED Caliblation
Purpose
1. Performs correction on the dispersion that is caused by the LED lamp color sensitivity. Calculates a*
and b* from the Y Patch scan value of Calibration Chart (STP5001) and then compares them with
reference values that were pre-set in the NVM to select the Correction Coefficient No. to set in the
NVM.
2. At the same time, IIT Calibration is also performed to obtain the Reflective Ratio of each color by
scanning each YMCK Patch of Calibration Chart (STP5001) and store them in the NVM.
NOTE: LED Calibration is to be performed during CE Image Quality adjustment after replacing the LED
Lamp PWB or CIS Unit.
Procedure
1. Use the [Down arrow] button to select [LED Calibration], and press the [OK] button.
Figure 1 j0bs64161
2. Press the [OK] button.
Figure 2 j0bs64162
3. Place the chart (STP5001) on the Platen and press <OK> to start the LED Calibration.
Figure 3 j0bs64163
Version 1.1
DC SC2020
4. When the LED Calibration has completed, the following measured values will be displayed .
Use <Up> and <Down> on the control panel to scroll through the display and select [OK] to display-
the result. Select [Back] to return to the previous screen.
(1) IIT Reflectivity
• R, G, B/ Y, M, C, K: numeric display (IIT Reflectivity_NVMs [715-282 to 715-293])
• Result: displays [OK] or [NG].
(2) Scan Image (for ENL/FMC), Result: displays [OK] or [NG]
• LED correction coefficient (NVM715-281)
• Calculated Value Before b* Correction (NVM715-269) b*: Reference value
(3) Scan Image (for FLC), Result: displays [OK] or [NG]
• b*correction coefficient (NVM715-280)
• Calculated Value After b* Correction (NVM715-263) b*: Reference value
5. Press the [<--] (Back) button to return to the [Fax/ Scanner Diag] screen.
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Figure 4 j0bs64164
6.4.16.5 LED Caliblation
General