HP Color LaserJet 2840 User Manual

ProblemCauseSolution
More than one sheet feeds at
one time.The media tray might be
overloaded.Remove some of the media
from the tray. See 
Loading trays.
The media might be wrinkled,
folded, or damaged.Verify that the media is not
wrinkled, folded, or damaged.
Try printing on media from a
new or different package.
Device does not pull media
from the media input tray.The device might be in manual
feed mode.●If Manual feed appears on
the device control-panel
display, press E
NTER to
print the job.
●Verify...

ProblemCauseSolution
Pages did not print.The device might not be pulling
media correctly.See Media-handling problems.
The media is jamming in the
device.Clear the jam. See Clearing
jams.
The USB cable might be
defective or incorrectly
connected. ●Disconnect the USB cable
at both ends and
reconnect it.
●Try printing a job that has
printed in the past.
●Try using a different USB
cable.
Other devices are running on
your computer.The device might not share a
USB port. If you have an
external hard drive or...

Scan problems
This section helps you identify and resolve scanning problems.
Solving scanned image problems
Use the table below to solve image-scan issues.
ProblemCauseSolution
The scanned image is of poor
quality.The original might be a second-
generation photo or picture.●To eliminate the patterns,
try reducing the size of the
image after scanning.
●Print the scanned image to
see if the quality is better.
●Verify that your resolution
and color settings are
correct for the type of scan
job that you are...

ProblemCauseSolution
Part of the image did not scan.The original might have been
loaded incorrectly.Use the media guides when
you load the originals into the
ADF. See 
To load originals into
the automatic document feeder
(ADF).
A colored background might be
causing images in the
foreground to blend into the
background.Try adjusting the settings
before you scan the original or
enhancing the image after you
scan the original. See 
Scanner
resolution and color.
The original is longer than 381
mm (15...

ProblemCauseSolution
The scan takes too longThe resolution or color level is
set too high.Change the resolution and
color level settings to the
correct settings for your job.
See 
Scanner resolution and
color.
The software is set to scan in
color.The system default is color,
which takes longer to scan
even when scanning a
monochrome original. If you
acquire an image through
TWAIN or WIA, you can
change the settings so that the
original scans in grayscale or
black-and-white. See the
device software Help...

Solving scan-quality problems
ProblemCauseSolution
Blank pagesThe original might have been
loaded upside down.In the automatic document
feeder (ADF), put the top end
of the stack of originals into the
ADF input tray, with the media
stack face-up and the first page
to be scanned on top of the
stack.
On the flatbed scanner, place
the original document face-
down with the upper-left corner
of the document at the lower-
right corner of the glass.
Too light or darkThe resolution and color levels
may be set...

Copy problems
This section helps you identify and resolve copying problems.
Preventing problems
The following are a few simple steps you can take to improve copy quality:
●Copy from the flatbed scanner. This will produce a higher quality copy than copying from
the automatic document feeder (ADF).
●Use quality originals.
●Load the media correctly. If the media is loaded incorrectly, it might skew, causing
unclear images and problems with the OCR application. See 
Loading documents to
scan for...

ProblemCauseSolution
Vertical white or faded stripes
appear on the copy.The media might not meet
HP specifications.Use media that meets
HP specifications. See 
Media
specifications.
One or more print cartridges
might be low.Replace any low print
cartridges. See 
Changing a
print cartridge.
Unwanted lines appear on the
copy.Tray 1 might not be placed
correctly.Verify that tray 1 is in place.
The flatbed scanner or the ADF
glass might be dirty.Clean the flatbed scanner or
the ADF glass. See 
To clean
the...

ProblemCauseSolution
Dropouts, jamming, or curlThe paper has been stored
incorrectly.Store paper flat in its moisture-
proof wrapping.
The paper has variability from
one side to the other.Turn the paper over.
Excessive curlThe paper is too moist, has the
wrong grain direction, or is of
short-grain constructionOpen the rear output bin, or
use long-grain paper.
The paper varies from side-to-
side.Turn the paper over.
Jamming, damage to deviceThe paper has cutouts or
perforations.Use paper that is free of...

ProblemCauseSolution
Device does not pull media
from the media input tray.The device might be in manual
feed mode.●If Manual feed appears on
the device control-panel
display, press E
NTER to
print the job.
●Verify that the device is not
in manual feed mode and
print your job again.
The pickup roller might be dirty
or damaged.Contact HP  Customer Care.
See 
Service and support or the
support flyer that came in the
device box.
The paper-length adjustment
control in tray 2 (HP Color
LaserJet 2840 all-in-one...