Poor print quality and unexpected printouts

Poor quality printouts

Check the printheads and ink cartridges

Print the print quality diagnostic page on a clean sheet of white paper. Evaluate any problem areas, and perform the recommended actions (see To print the print quality diagnostic page).

Replace any ink cartridges that are low on ink, and try to print again. See Replacing the ink cartridges.

Check the paper quality

The paper might be too moist or too rough. Make sure the media used meets HP specifications, and try to print again. See Selecting print media.

Check the type of media loaded in the printer

Make sure the tray supports the type of media you have loaded. See Understanding specifications for supported media.

Make sure you have selected the tray in the printer driver that contains the media that you want to use.

Check the printer location and length of USB cable

High electromagnetic fields (such as those generated by USB cables) can sometimes cause slight distortions to printouts. Move the printer away from the source of the electromagnetic fields. Also, it is recommended that you use a USB cable that is less than 3 meters (9.8 feet) long to minimize the effects of these electromagnetic fields.

Meaningless characters print

If an interruption occurs to a job that is printing, the printer might not recognize the rest of the job.

Cancel the print job and wait for the printer to return to the ready state. If the printer does not return to the ready state, cancel all jobs and wait again. When the printer is ready, resend the job. If prompted by the computer to retry the job, click Cancel.

Check the cable connections

If the printer and computer are connected with a USB cable, the problem may be due to a poor cable connection.

Make sure the cable connections at both ends are secure. If the problem persists, turn off the printer, disconnect the cable from the printer, turn on the printer without connecting the cable, and delete any remaining jobs from the print spooler. When the Power light is on and not flashing, reconnect the cable.

Check the document file

The document file may be damaged. If you can print other documents from the same application, try printing a backup copy of your document, if available.

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Chapter 4 Maintaining and troubleshooting

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HP K550 manual Poor print quality and unexpected printouts, Poor quality printouts, Meaningless characters print