Not printing/ faded printing on middle of page

Laserjet printers are known for its exceptionally print capacity. Like, all electronic gadgets, the printers will also throw errors. If your Laserjet printer abruptly stops printing or produces faded prints, study the instructions given on this web page.
1) Incompatible ink cartridges or accumulation of dust in the printhead can be the reason for the faded print quality.
2) It is suggested to use compatible and genuine ink cartridges for better efficiency. Use HP SureSupply to order the ink.
3) Examine if the appropriate media type is used in the Laserjet printer. Do not use curled, wet, or wrinkled papers during printing.
4) If the ink level is critically low, the issue might reoccur. Replace the low ink level cartridge with a new one to fix the issue.
5)If the report is not satisfactory, align the ink cartridges. This is done for obtaining high-quality printouts.
6)Clean the ink nozzles with a clean, damp cloth. If the issue persists, call our toll-free number to fix it.
7)Use a flashlight to check for jammed papers. Remove the hindrances present on the carriage path.
8)Download and run the HP Print and Scan Doctor tool to identify and rectify the printing issues.
For more printer queries just give a call @ 1-866-293-9220

The HP site suggests replacing the toner cartridge.
This is an excellent, by the way, which has very good troubleshooting ditections
www.hp.com