HP Laserjet 4350dtn Print Quality poor

usely it's the fuser sleeve the problem. replace the fuser but before be shure the cartridge is ok. print something and open the cartridge door when printing to see under the cartridge the print quality if ok replace the fuser unit

Problem with cleaning blade,which fails to clean properly on surface of the drum..Replace it..

Hi, check the resolution (ppi) settings when doing the scan. Be careful too with the glass of the scanning surface. Clean it with a fiberless fabric

Hi

For increase the print quality go to the printer properties and go printer preference and select the device setting and set your setting.

Here's some troubleshooting steps for your Print Quality Issue:
Print Quality & Copy Quality Problem: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=3644750&prodTypeId=18972&prodSeriesId=3644750&objectID=c01450583
Image shift Issue while Copying: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=3644750&prodTypeId=18972&prodSeriesId=3644750&objectID=c02622841

Hope it helps. Have a nice day.

clean the print head 3 times,then realign the head .these are done by printer utility software given with the printer.
Even not ok.
Then Replace the New Catridge.(manufactured from within 3 of 4 months).because the ink will be dried with in 6 month.So Buy Carefully with Mfd Date.

Thank you

Sounds like its time for a new drum/print cartridge. When it get worn you start to get poor quality prints and sometimes lines. COule also be scratched and transfering the line on the prints but in either case needs to be replaced.

Have you check the teflon at the heater? have you clean the reflector of laser? Try that.

Try performing a test by printing a test page from Tray 1 and open the top cover as soon as the paper is 60% inside. The paper would jam below the toner cartridge before it reaches the fuser. Remove the toner cartridge carefully and verify if the smudges occur. This would eliminate the fuser. If the print quality is fine, then you need to swap the fuser.

Are you saying it is this problem?

Gray Background Print Quality Defect

Here's another error that might fit the bill:

Vertical Lines Print Quality Defect

If these documents don't quite describe the issue, please post back with more details. Thanks.