Panasonic 8420 Operating Instructions Manual

							 
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 
scratches (visible by 
holding the print at an 
angle and observing the 
“shine” of the image). At 
first, the scratches 
appear only on the 
printed image; 
eventually, dark vertical 
scratches appear on the 
imprinted portion of the 
page.The fuser is near its 
useful life.Replace the fuser 
(depending on your 
quality needs, you 
can continue to print 
until the dark vertical 
lines appear).
Media frequently wraps 
around the fuser.The oil supply roll has 
reached its useful life.Replace the oil supply 
roll.
Light vertical streaks 
appear in all colors.The main charge grid 
is dirty.Replace the color 
imaging unit.  
Trouble
Possible CauseCorrective Action 
						

							 
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. 
The page prints in black 
in the image area only. 
(The borders are clear.)Either the image 
processor board or 
engine control board 
is not functioning 
properly.Turn the printer off 
and back on again. If 
the problem persists, 
call for service on 
your printer. 
Trouble
Possible CauseCorrective Action 
						

							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
Printer not operating. Make sure that you plugged in the printer and 
turned it on.
Make sure that you connected the interface 
cable(s) properly.
More info to come for 
these messages.If the communication link between your 
computer and the printer is working but the 
printer ejects a blank page when printing from 
your application or through Windows. Make 
sure that the appropriate driver is installed and 
that you have selected the printer correctly.
TroublePossible CauseCorrective Action
The setting for printing 
is not effective.Some applications 
may not allow you to 
change the settings 
through the 
KX-P8420 printer 
driver’s setting 
window.Change the 
application’s settings.
TroublePossible CauseCorrective 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 
2nd Cassette Feeder, make sure that the 
transparency tray is installed in the upper or middle 
tray slot.
Clean the paper-pick rollers. (See page 144 for 
directions.)
Frequent media 
jams.Make sure that you use a high-quality laser paper: 
60–105 g/m
2 (16-28 lbs.) paper in the media trays 
and 75–165 g/m
2 (20–44 lbs.) paper in the multi-
purpose tray.
If you are using media that is 105 g/m
2 (28 lbs.), 
check if the Face Down media output setting is 
selected in the driver. If it is, change the setting to 
Face Up.
Use only recommended transparencies. (See 
page 209.) We cannot guarantee the results of other 
transparencies.
Make sure that the media is installed under the 
hooks at the front of the media tray.
Do not overfill the media tray, as indicated by the red 
line on the right side of the tray.
Clean the paper-pick rollers. (See page 144 for 
directions.)
Make sure that the media thickness switch is set 
correctly for the installed media. (See page 39.) 
						

							 
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 installing it in the printer. 
Exposure to light for more than 45 seconds can 
damage the color imaging unit.
Make sure that the toner cartridges are installed 
correctly.
Make sure that you use a high-quality laser paper: 
60–105   
g  
/m
 
2 
 (16-28 lbs.) paper in the media trays 
and 75–165   
g  
/m 
2 
 (20–44 lbs.) paper in the multi-
purpose tray.
Image is very 
faded or pieces of 
the image are 
missing; toner on 
the page is loose.When using the multi-purpose tray, make sure that 
you have selected the correct media type in the 
driver or in the Menu mode of the printer panel. 
						

							 
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 will produce light streaks or faded prints.
Do not touch the right side or underside of the color 
imaging unit; fingerprints affect print quality.
Make sure that the paper or transparency film is 
clean.
Make sure that you handle the media on the outside 
edges to avoid fingerprints.
To get rid of fingerprint spots, print a few prints.
The back of the 
printed page 
appears dirty.Toner particles have contaminated the transfer 
roller. This can happen if the printed image is larger 
than the media (for example, when printing on 
envelopes). Run 10-20 prints to clean the transfer 
roller.
The print quality of 
a transparency is 
poor.There is a defect on the coated surface of the 
transparency. Print on the other side. 
Trouble
Corrective Action 
						

							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 blink. Printing 
will continue when corrective action (if required) is taken, and the Ready 
indicator is lit.
MessageCorrective action/additional information
%s%s.%s Error 
DIMM Slot %sCycle Power. If printer does not function 
normally, call for service.
Black Toner Cartridge 
Not installedInstall black toner cartridge.
Black Toner
EmptyReplace black toner.
Canceling JobWhen the Cancel/Left button is pressed, the 
job currently being processed is deleted.
Cannot recover from JAM
Press EnterSemi Automatic duplex is aborted by jam.
Charger 
Not installedInstall the charger unit.
Controller Memory Error
Cycle PowerCycle Power. If printer does not function 
normally, call for service.
Cyan Toner Cartridge 
Not installedInstall cyan toner cartridge.
Cyan Toner
EmptyReplace cyan toner.
DC Controller 
MalfunctionCycle Power. If the printer does not function 
normally, call for service.
Disk File
Operation FailedHard disk is functioning abnormally. Cycle 
Power. If printer does not function normally, 
call for service.
Front panel 
status and error 
messages 
						

							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 
printer does not function normally, call for 
service.
Flash File
Operation FailedHard disk is functioning abnormally. Cycle 
Power. If printer does not function normally, 
call for service.
Front or Right door
OpenClose Front or Right door.
Fuser Unit 
wearing outFuser unit will need to be replaced soon.
Fuser Unit
Not installedInstall a Panasonic fuser unit.
Fuser Unit
Worn outReplace the fuser unit.
Imaging Unit 
wearing outImaging unit will need to be replaced soon.
Imaging Unit
No tensionSet the upper lever of the imaging unit to 
“Lock”.
Imaging Unit
Not installedInstall imaging unit.
Imaging Unit
Worn outReplace the imaging unit.
InitializingPrinter is initializing.
Insert printed pages in
MP tray, press ContinueInsert printed pages into multi-purpose (MP) 
tray, then press the Continue/Forward 
button.
MessageCorrective action/additional information 
						

							 
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 label 
Clear paper jam. See front door label. 
(See page 164.)  
Jam at E
See front door label 
Clear paper jam. See front door label. 
(See page 166.)  
Jam at MPT 
Clear paper jam. See front door label. 
(See page 166.)  
Left side door
Open 
Close Standard Cassette side door. 
Load A4 
Load A4 size paper. 
Load A4
in Lower tray 
Load A4 size paper in Lower tray. 
Load A4
in Middle tray 
Load A4 size paper in Middle tray. 
Load A4
in Upper tray 
Load A4 size paper in Upper tray. 
Load Legal 
Load legal size paper. 
Load Legal
in Lower tray 
Load legal size paper in Lower tray. 
Load Legal
in Middle tray 
Load legal size paper in Middle tray. 
Load Legal
in Upper tray 
Load legal size paper in Upper tray. 
Load Letter 
Load letter size paper. 
Load Letter
in Lower tray 
Load letter size paper in Lower tray. 
Message
Corrective action/additional information 
						

							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 installedInstall Lower tray.
Magenta Toner Cartridge 
Not installedInstall magenta toner cartridge.
Magenta Toner
EmptyReplace magenta toner.
Media Tray
EmptyAdd media to Media tray.
Media Tray
Not installedInstall Media tray.
Memory Error 0Cycle Power.
Memory Error 1Cycle Power.
Memory Error 2Cycle Power.
Memory Error 3Cycle Power.
Memory Error 4Cycle Power.
Memory Error 5Cycle Power.
Memory Error 6Cycle Power.
Memory Error 7Cycle Power.
Memory Error 8Cycle Power.
MessageCorrective action/additional information