Print Quality Problems; Paper Feeding Problems - HP 640 series User Manual

Troubleshooting

Print quality problems

Problem
Light or blurred characters.
Smudged or dark characters.
Characters with white lines.
Improperly formed or misaligned
characters.
Abnormal black horizontal lines

Paper feeding problems

Problem
Paper is jammed during printing.
Paper sticks together.
Paper fails to feed.
Multiple sheets of paper feed.
Paper skews or buckles in the
paper tray.
56 Care and maintenance
Solution
Check ink level as described in
install a new print cartridge, see
on page 44.
Make sure the print cartridge is installed correctly. To clean the
Maintain the print cartridge
print cartridge, see
Make sure the paper is straight and unwrinkled. Let ink dry
before handling the paper. To clean the print cartridge, see
Maintain the print cartridge
If Ink Low. Install new ink cartridge is displayed,
install a new print cartridge as described in
cartridge
on page 44.
Remove and reinstall the print cartridge.
Clean the print cartridge (see
page 47).
Clean the print cartridge (see
nozzles
on page 47).
Clean the cartridge carrier (see
contacts
on page 48).
Solution
Clear paper jam as described in
on page 46.
• Make sure you have fewer than 50 sheets in the paper tray.
• Humid conditions may cause some paper to stick together.
Take the paper out and fan the pages and replace.
Remove any obstructions inside the printer.
When loading paper, do not force the paper down into the
printer. If multiple sheets have caused a paper jam, clear the
Paper jams during printing
paper jam. (see
The paper tray can hold up to 50 sheets. Make sure the paper
guides do not cause the paper to bow. When loading paper,
do not force it down into the machine.
View ink level
on page 43. To
Replace the print cartridge
on page 47.
on page 47.
Replace the print
Maintain the print cartridge
Clean the print cartridge
Clean the cartridge carrier
Paper jams during printing
on page 46.)
on