HP 4000TN faded output

[johnny unix]

How can I fix a faded output problem on an HP4000 with a new toner cartridge. The old cartridge had the same problem.
Thanks in advance.

[ptjeff1]

Is it faded evenly accross the page? Did this start happening suddenly or did it get gradually worse over time?

[johnny unix]

The fade is even across the page. There is a 1/8 inch darker line on the left hand side of the paper though. The change has been gradual. Thanks.