HP LaserJet M1120 User Manual

Critical error messages
Critical error messages can indicate some kind of failure. Turning off and then turning on the power
might fix the problem. If a critical error persists, the product might require service.
Critical error message-tables
Control panel messageDescriptionRecommended action
50.1 Fuser Error
Turn off then onThe product has experienced an internal
hardware error.1.Turn off the power by using the power
switch, and then wait at least 30
seconds.
2.If a surge protector is being used,
remove...

Control panel messageDescriptionRecommended action
If a surge protector is being used, remove it.
Plug the product directly into the wall socket.
Use the power switch to turn the product on.
If the error persists, contact HP. See
www.hp.com/support/LJM1120 or the
support flyer that came in the product box.
52 Scanner Error
Turn off then onThe product has experienced a scanner
error.Turn off the power by using the power switch,
wait at least 30 seconds, and then turn on the
power and wait for the product...

Control-panel display problems
CAUTION:Static electricity can cause unexpected black lines or dots to appear on the product control-
panel display. Do not touch the product control-panel display if there is a chance that you have collected
a static electric charge (for example, by walking on carpet in a low-humidity environment).
Unexpected lines or dots might appear on the product control-panel display, or the display might become
blank if the product is exposed to an electric or magnetic field. To...

Where to look for jams
Jams can occur in these locations:
●In input areas
●In output areas
●In the print-cartridge area
Find and remove the jam by using the instructions on the following pages. If the location of the jam is
not obvious, first look inside the product.
Loose toner might remain in the product after a jam. This problem typically resolves itself after a few
sheets have been printed.
Clear jams from the input-tray areas
CAUTION:Do not use sharp objects, such as tweezers or needle-nose pliers,...

3.With both hands, grasp the side of the media that is most visible (this includes the middle), and
carefully pull it free from the product.
4.Open tray 1 and remove the media stack.
5.With both hands, grasp the side of the jammed media that is most visible (this includes the middle),
and carefully pull it free from the product.
ENWWClear jams 85
 

6.Replace the print cartridge and close the print-cartridge door.
86 Chapter 11   Problem solve ENWW
 

Clear jams from the output bin
CAUTION:Do not use sharp objects, such as tweezers or needle-nose pliers, to remove jams.
Damage caused by sharp objects will not be covered by the warranty.
With both hands, grasp the side of the jammed media that is most visible (this includes the middle), and
carefully pull it free from the product.
ENWWClear jams 87
 

Clear jams from the print-cartridge area
CAUTION:Do not use sharp objects, such as tweezers or needle-nose pliers, to remove jams.
Damage caused by sharp objects will not be covered by the warranty.
When removing jammed media, pull the jammed media straight away from the product. Pulling jammed
media out of the product at an angle can damage the product.
1.Open the print-cartridge door, and remove the print cartridge.
CAUTION:To prevent damage to the print cartridge, minimize its exposure to direct...

Avoid repeated jams 
●Verify that the input tray is not overfilled. The input tray capacity varies depending on the type of
print media that you are using.
●Verify that the media guides are properly adjusted.
●Check that the input tray is securely in place.
●Do not add print media into the input tray while the product is printing.
●Use only HP-recommended media types and sizes.
●Do not fan media prior to loading it in a tray. To loosen the ream, hold it firmly in both hands and
twist the media by...

Solve image-quality problems
Print problems
Print quality problems
Occasionally, you might encounter problems with print quality. The information in the following sections
helps you identify and resolve these issues.
General print-quality issues
The following examples depict letter-size paper that has passed through the product short-edge-first.
These examples illustrate problems that would affect all of the pages that you print. The topics that follow
list the typical cause and solution for each of...