Panasonic 8420 Operating Instructions Manual

131 Color Calibration
To compare current setting with the color density samples:
1Compare the current color density settings on the Color 
Calibration Page with the color density samples on the 
Color Calibration Card to see if they match.
Place the Color Calibration Page on at least 2 sheets of clean white 
paper in a well-lighted area.
•If they match, then you do not need to adjust the color density 
and you may proceed with any operation you wish to perform.
•If they do not match, proceed to “To...

132
To per form Bias Adjustment: 

133 Color Calibration
4) Press the Continue/Forward or Cancel/Left button 
to darken/lighten the cyan color.
To make the color density setting of the Color Calibration Page 
darker or lighter by 1 level, increase or decrease a value of the 
CYAN density by 3 by pressing the Continue/Forward or Cancel/
Left button.
For example when the CYAN density is 0:
•If you wish to make the density setting darker by 1 level:
—Select 3 by pressing the Continue/Forward button 3 times.
•If you wish to make the density...

134 Color Calibration
VisualCal, 30% match calibration
VisualCalTM is a calibration method that allows you to calibrate your printer 
to an ideal color output standard.
The calibration calculations performed by the controller software are based 
on a series of values entered through the front panel. The values used in 
the calculations are determined by evaluating toner densities and color 
combinations produced on two specially designed calibration pages printed 
from the front panel.
The first...

135 Color Calibration
The following procedure outlines how to calibrate the printer using 
VisualCal.
To perform VisualCal calibration:
1From Ready or Ready(Sleep), press the Menu button 
and then press the Continue/Forward button 
repeatedly to advance to the Visual Calibration menu. 
Press the Enter button.
2When the screen displays Endpoint Page on the first 
line and Print on the second line, press the Enter 
button.
Wait for the VisualCal Limits and 30% Match page to be printed. 
You will use this...

136 Color Calibration
3When the screen displays Black Low, begin the 
process of specifying Low and High values for each of 
the four toner colors, and a value for the 30% Match.
Follow the instructions provided on the Limits and 30% Match page.
For startpoints and endpoints:
—Locate the leftmost circle you can distinguish from its background. 
For best visibility, view the page at an angle under normal lighting 
conditions. Position the page over several sheets of white paper. 
For 30% match (bottom...

137 Color Calibration
NOTE:
•Zero (0) and 9 are unacceptable values for color calibration. If 
any of the entered values for any colors are 0 or 9, the Limits and 
30% Match page is reprinted automatically. Reenter values for all 
color rows starting with Black Start (Black Low).
When you have finished entering all values, the Gray Balance Page 
menu appears.
4To print the Gray Balance page, press the Enter 
button.
The Gray Balance page is printed and Best Patch (row) appears.
VisualCal
Gray Balance
The...

 
138 Color Calibration 
5 
Select the row number of the most acceptable patch. 
Use the   
Cancel/Left  
 button or the   
Continue/Forward  
 
button to select a value (+4 to –4). Accept a value by 
pressing the   
Enter   
button. (See the example below.) 
Best Patch (col) appears. 
6 
Select the column number(R, Y, G···) of the most 
acceptable patch. Use the   
Cancel/Left  
 button or the   
Continue/Forward  
 button to select the column. Accept 
a value by pressing the   
Enter   
button. (See...

139 Color Calibration
7To print a Color Test that uses the original values and a 
Color Test that uses the new values, press the Enter 
button.
NOTE:
•You can skip printing Color Test page by selecting Skip.
Before applying the calibration changes compare the Color Test 
that uses the original calibration values against the Color Test that 
uses the new values. If you are satisfied with the printer’s 
calibration based on the new values, select Yes from the Apply 
Changes screen that appears, and press...

140 Color Calibration
To reset VisualCal calibration:
1From Ready or Ready(Sleep), press the Menu button 
and then press the Continue/Forward button 
repeatedly to advance to the Visual Calibration menu. 
Press the Enter button.
2When the screen displays Endpoint Page on the first 
line and Print on the second line, press the Enter 
button.
Wait for the VisualCal Limits and 30% Match page to be printed.
3For the Black Low menu and Black High menu, press 
the Enter button each. For the subsequent menus:...