Panasonic 8420 Operating Instructions Manual

141 Color Calibration
Color adjustment 
The printer’s color adjustment feature provides additional creative control 
over printer’s color production. The color adjustment screens, accessible 
via the front panel, allow you to override the printer’s current toner density 
and brightness settings.
Using the color adjustment controls, you can also increase or decrease the 
brightness of an image, or you can increase or decrease the density of each 
the following colors: red, yellow, green, cyan, blue or...

142 Color Calibration
5To print a Color Test that uses the new values, press 
the Enter button.
Color Adjust Test pages that use the previous value and the new 
values are printed.
6Press the Enter button.
The Apply Changes menu appears.
7To apply the new color and brightness values use the 
Cancel/Left button or the Continue/Forward button to 
select Yes. Press the Enter button.
NOTE:
•Changes made using Color Adjustment are retained until the printer is 
recalibrated. Or reset the adjusted colors to...

143 Color Calibration
To reset Color adjustment:
1From Ready or Ready(Sleep), press the Menu button 
and then press the Continue/Forward button 
repeatedly to advance to the Color Adjustment screen. 
2Press the Enter button twice.
The Brightness menu appears.
3Press the Enter button twice. 
The Adjust Color menu appears.
4Use the Cancel/Left button or the Continue/Forward 
button to select Reset All, and press the Enter button.
5Use the Cancel/Left button or the Continue/Forward 
button to select Yes,...

Chapter 8
144Care and Maintenance
Cleaning
Periodic cleaning of the printer is recommended, depending on the 
environment in which the printer is used. You should clean the printer:
•At least once a month
•When the printer experiences frequent media jams
•When print quality starts to deteriorate
To clean the outside of the printer:
1Turn the power OFF.
2Clean all the covers with a soft cloth, using any mild 
commercial cleaner.
CAUTION:
•Do not use benzine, thinner, aerosol cleaners, or any abrasive...

 
145 Care and Maintenance 
3 
Use the green handles to pull out the paper feeder. 
4 
Gently rotate the paper-pick rollers 180° (the paper-pick 
rollers are D-shaped) and wipe them with a lint-free 
cloth moistened with isopropyl alcohol. 
5 
a  
) Reinsert the paper feeder.  
b  
) Close the left side door.
a
b 

 
146 Care and Maintenance 
6 
Slide the media tray back into place.
NOTE:
 
• 
If you have a 2nd Cassette Feeder, you may also need to clean 
the rollers for the middle and lower media trays, which are 
accessed through the   
lower  
 left side door. 
To clean the home sensor:  
If your printer panel displays   
PRINTER ERROR 30  
, clean the home sensor 
inside the printer. 
1 
Open the printer’s front door. 
2 
Remove the color imaging unit.  
a  
) Loosen the two thumbscrews by turning them...

 
147 Care and Maintenance 
3 
a  
) Grasping the front green handle, slide the color
imaging unit out until it catches.  
b  
) Lift up the left green handle. Pull the color imaging 
unit out of the printer and cover it to protect it from 
light exposure.
IMPORTANT:
 
• 
Do not touch the green surface (the right side) or the black belt 
(the underside). Finger prints may affect the print quality.
SAFETY CAUTION:
 
• 
The color imaging unit weighs approximately 6.5 k  
g  
 {14.3 lbs.}. 
Always use the...

 
148 Care and Maintenance 
5 
Reinsert the color imaging unit into the printer, holding it 
by its green handles. 
Match the arrow on the right side of the color imaging unit with the 
arrow on the printer, and slightly push the color imaging unit into the 
printer. Then release the left handle and push the unit in until it 
stops. 
6 
a  
) Turn the lower green lever clockwise 180° to insert 
the unit completely and to lock it.  
b  
) Tighten the two green thumbscrews by turning them 
clockwise.  
c...

 
149 Care and Maintenance 
User replaceable components 
When the printer panel indicates that a supply needs to be replaced, make 
sure that you have replacement supplies on hand. The printer may continue 
to print until the supply is completely used up; but then it stops until you 
replace the indicated supply.
* 
1 
These figures are based on an average of 5% coverage of the printable 
area and standard density for any one color (refer to Example A below 
left: Monochrome 5% coverage). 4 colors (Cyan,...

150 Care and Maintenance
*1Refer to *1 on page 149.
*2The starter cartridges that ship with the printer have an average life of 
approximately 3,000 pages, based on an average of 5% coverage.
*
3Specialty media (Transparencies, coated paper, etc.) will result in 
shortening the life of a consumable to maintain better print quality. When 
replacing the fuser unit, replace the oil supply roll as well. Do not insert 
the used oil supply roll into the new fuser unit; it may damage the 
new fuser unit....