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ADJ 9.2 Image Quality Adjustment Routine
Purpose
The Image Quality Adjustment (IQA) feature allows adjustment of the image quality by adjust-
ment of the Grid Voltage and ROS Exposure levels. This is achieved by running an Image
Quality Adjustment routine from within SAKO tools. This routine can be performed at any stage
of the machine's operational life by the key operator.
Adjustment
The adjustment routine consists of the steps that follow:
1.
Load A4 (8.5x11 inch) white paper LEF in the Bypass Tray.
2.
Turn off or reset to nominal all image enhance features.
3.
Select Key button (Access A).
4.
Enter Password.
5.
Select Go To Tools
6.
Select More
7.
Select Machine Test
8.
Select Image Quality Adjustment
9.
Follow the prompts in the image quality adjustment window.
10. Example of the IQA test pattern is shown in Figure 1.
11. When the test pattern image is scanned, the following sequence of events occur:
a.
The average image density (grey level measured on a grey scale; 0 = black, 255 =
white) of the shadow and highlight is measured to obtain two respective averages. If
the average for either the highlight or shadow is out of range, the image cannot be
used reliably and the routine is terminated with an appropriate message displayed
on the GUI.
b.
Once the validity of the test pattern has been confirmed the measured average grey
levels of the shadow and highlights are compared against shadow and highlight
Grey Level reference values contained in NVM, producing a shadow error and high-
light error.
c.
These errors are then used together with pre-stored IQA factors to determine a Grid
Voltage Offset and a ROS exposure Offset.
d.
Range checking and capping is then performed to limit any unexpected behavior.
e.
The SIP sends these offsets to the IOT to be stored in IOT NVM.
f.
The Grid Voltage and ROS exposure are then adjusted by applying the relevant off-
set to the nominal setting after to any other adjustments are applied (e.g. calibration
or Process Control adjustments etc.).
12. If a fault occurs on completion of the routine then refer to the relevant RAP.
Repairs/Adjustments
ADJ 9.2
Figure 1 IQA test pattern
August 2007
4-636
WorkCentre 5687 Family
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