HP Officejet Pro 8500A User Manual

5.Before installing a printhead, shake the printhead up and down at least six times
while the printhead is still in its packaging.
6.Remove the new printhead from its package, and then remove its orange
protective caps.
CAUTION: Do not shake printheads after the caps are removed.
7.Insert the printhead into its color-coded slot (the label on the printhead must match
the label on the printhead latch). Press down firmly on the printhead to ensure
proper contact.
8. Pull the printhead latch all the way...

Solve paper-feed problems
Media is not supported for the printer or tray
Use only media that is supported for the printer and the tray being used. For more
information, see 
Mediaspecifications.
Media is not picked up from a tray
• Make sure media is loaded in the tray. For more information, see 
Loadmedia. Fan
the media before loading.
• Make sure the paper guides are set to the correct markings in the tray for the media size you are loading. Also make sure the guides are snug, but not tight,
against...

Multiple pages are being picked up
• Fan the media before loading.
• Make sure the paper guides are set to the correct markings in the tray for themedia size you are loading. Also make sure the guides are snug, but not tight,
against the stack.
• Make sure the tray is not overloaded with paper.
• When using thin special media, make sure that the tray is completely loaded. If you are using special media that is only available in small quantities, try placing the
special media on top of other paper of the...

Copies are blank
•Check the media
The media might not meet Hewlett-Packard media specifications (for example, the
media is too moist or too rough). See 
Mediaspecifications for more information.
• Check the settings
The contrast setting might be set too light. On the printer control panel, touch
Copy , touch  Lighter Darker , and then use the arrows to create darker copies.
• Check the trays
If you are copying from the automatic document feeder (ADF), make sure that the
originals have been loaded...

Copy quality is poor 
•Take steps to improve the copy quality

•Use quality originals.

• Load the media correctly. If the media is loaded incorrectly, it might skew,
causing unclear images. See 
Mediaspecifications for more information.

• Use or make a carrier sheet to protect your originals.
• Check the printer

•The scanner lid might not be closed correctly.

• The scanner glass or lid backing might need cleaning. See 
Maintaintheprinter
for more information.

• The automatic document feeder (ADF)...

•Large, black typefaces look splotchy (not smooth)
The default enhancement setting might not be suitable for the job. Check the
setting and change it to enhance text or photographs, if needed. For more
information, see 
Changecopysettings.
• Horizontal grainy or white bands in light-gray to medium-gray areas
The default enhancement setting might not be suitable for the job. Check the
setting and change it to enhance text or photographs, if needed. For more
information, see 
Changecopysettings.
The...

Scan takes too long
•Check the settings

•If you set the resolution too high, the scan job takes longer and results in larger
files. To obtain good results, do not use a resolution that is higher than
needed. You can lower the resolution to scan more quickly.

• If you acquire an image through TWAIN, you can change the settings so that
the original scans in black and white. See the onscreen Help for the TWAIN
program for information.
• Check the status of the printer
If you sent a print or copy job...

•The accuracy of the OCR program depends on the image quality, text size,
and structure of the original and the quality of the scan itself. Make sure that
your original has good image quality.

• Colored backgrounds can cause images in the foreground to blend too much.
Try adjusting the settings before you scan the original, or try enhancing the
image after you scan the original. If you are performing an OCR operation on
an original, any colored text on the original does not scan well, if at all.
Error...

The image quality is better when printed
The image that appears on the screen is not always an accurate representation of the
quality of the scan.

•Try adjusting your computer monitor settings to use more colors (or levels of gray).
On Windows computers, you typically make this adjustment by opening  Display
on the Windows control panel.

• Try adjusting the resolution and color settings.
The scanned image shows blots, lines, vertical white stripes, or other defects

• If the scanner glass is dirty,...

•Black dots or streaks

•Ink, glue, correction fluid, or an unwanted substance might be on the scanner
glass; the scanner glass might be dirty or scratched; or the lid backing might be
dirty. Try cleaning the scanner glass and lid backing. See 
Maintaintheprinter
for more information. If cleaning does not correct the problem, the scanner
glass or lid backing might need to be replaced.

• The defects might be on the original and are not a result of the scanning
process.
• Unclear text
Try adjusting the...