HP LaserJet 3015 - Manual (Page 87)

The device control panel display has black lines or dots, or fades
Try the tips in this section if the device control panel display has black lines or dots, or fades.
Black lines or dots
CAUTION Static electricity can cause unexpected black lines or dots to appear on the device control
panel display. Do not touch the device 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 device control panel display if the device
control panel display is exposed to a static electric charge. Wait until the black lines or dots
fade away (usually within a few minutes).
Note Do not print while the black lines or dots are visible.
Do not turn the device off and on. This does not solve the problem.
Faded device control panel display
CAUTION Magnets or strong electric fields can cause the device control panel display to fade. Do not
place the device near magnets or strong electric fields.
The device control panel display might fade if the device is exposed to magnets or strong
electric fields. Move the device away from the magnets or strong electric fields, and wait until
the device control panel display returns to normal (usually within a few minutes).
Note Do not print while the device control panel display is faded.
Do not turn the device off and on unless you are moving it to a different location. This does
not solve the problem.
ENWW The device control panel display has black lines or dots, or fades 77