Panasonic Color Laser Printer Kx P8420 Operating Instructions

 
171 Care and Maintenance 
A piece of the printed 
image is missing and 
reappears out of place, 
approximately 129 mm 
(5) down the page.The fuser’s internal 
roller is not being 
consistently oiled or 
the fuser’s internal 
roller is contaminated 
with toner particles.Print 5-10 pages of 
blank pages to clean 
the roller. If you still 
see the problem:
• Replace the oil 
supply roll.
If you still see the 
problem:
• Replace the fuser.
The surface of the 
printed image appears 
to have vertical...

 
172 Care and Maintenance 
Dark and wavy vertical 
streaks appear in all 
colors.The main charge grid 
is dirty.Replace the color 
imaging unit. 
The entire page prints in 
black, including the 
borders.Bad electrical contact 
for the main charge 
grid.Reinsert the color 
imaging unit to correct 
the contact for the 
main charge grid. 
The main charge grid 
is broken.Replace the color 
imaging unit.
Toner spots appear on 
the back of the media.The transfer unit is 
worn out.Replace the transfer 
unit....

173 Care and Maintenance
If you can’t make a print:
The page is completely 
blank.The problem could be 
with one of the 
following:
• Engine control 
board.
• Developer voltage.
• Laser scanning unit 
mirror.Turn the printer off 
and back on again. If 
the problem persists, 
call for service on 
your printer.
Service Error is 
displayed on the LCD.An error occurred that 
is not user-
correctable.Turn the printer off 
and back on again. If 
the error persists, call 
for service.
TroubleCorrective Action...

174 Care and Maintenance
Media problem
TroubleCorrective Action
Frequent paper-
picking errors.Fan the paper or transparencies before installing 
them in their respective trays; this is especially 
important for transparencies because they tend to 
stick together.
Make sure that you have loaded paper in the paper 
tray and transparencies in the transparency tray.
Make sure that the media is installed under the 
hooks at the front of the media tray.
If printing on transparencies and your printer has a...

 
175 Care and Maintenance 
Problems with image size and position
Print quality problems 
Trouble
Corrective Action  
Off-set images. Check your application for correct image sizing. 
Cut-off images. Check your application for image sizing. 
Make sure that the correct size media is in the 
media tray.
 
Trouble
Corrective Action  
Prints have dull, 
faded colors.Adjust or calibrate colors. See “Chapter 7 Color 
Calibration”.
Make sure that the color imaging unit stays covered 
until immediately before...

 
176 Care and Maintenance 
Streaks or spots  Most spots are caused by fingerprints or dust 
introduced into the printer while installing the color 
imaging unit or loading media. 
Make sure that the surface where you unpack the 
color imaging unit, paper, and transparencies is free 
of dust. Keep supplies in a covered area or a closed 
box.
Make sure that the color imaging unit stays covered 
until immediately before installing it in the printer. 
Exposure to light can damage the color imaging unit 
and...

177 Care and Maintenance
Front Panel Messages
When an error interferes with printing, you will see a message on the front 
panel. The following table lists the messages in alphabetical order, with the 
appropriate corrective action for each one.
NOTE:
•If the message indicates that you don’t have enough memory to finish 
printing, you may need to install additional memory to handle your 
workload. See “Installing additional memory” on page 199.
The following status messages cause the Ready indicator to...

178 Care and Maintenance
Disk Is FullErase or replace the printer’s hard disk. 
Execute the Reset Queues menu from the 
printer’s front panel. See “Reset Queues” on 
page 111.
Disk
Device FailureCycle Power. If printer does not function 
normally, call for service.
Error %s
Cycle PowerUnrecoverable error happened. Turn off the 
printer.
Engine Interface Error
Cycle PowerCycle Power. If printer does not function 
normally, call for service.
Flash 
Device FailureFlash DIMM hardware error. Cycle Power. If...

 
179 Care and Maintenance 
Insufficient
Memory 
Not enough memory to finish printing. 
Change printing resolution to 600 x 600 dpi if 
you selected higher resolution. 
or 
Install additional memory in the printer. 
Jam at A
See front door label 
Clear paper jam. See front door label. 
(See page 154.)  
Jam at B
See front door label 
Clear paper jam. See front door label. 
(See page 156.)  
Jam at C
See front door label 
Clear paper jam. See front door label. 
(See page 157.)  
Jam at D
See front door...

180 Care and Maintenance
Load Letter
in Middle trayLoad letter size paper in Middle tray.
Load Letter
in Upper trayLoad letter size paper in Upper tray.
Low Black TonerBlack toner will need to be replaced soon.
Low Cyan TonerCyan toner will need to be replaced soon.
Low Magenta TonerMagenta toner will need to be replaced 
soon.
Low Yellow TonerYellow toner will need to be replaced soon.
Lower Left side door
OpenClose Optional Cassette side door.
Lower Tray
EmptyAdd media to Lower tray.
Lower Tray
Not...