My HP 3390 is leaving a line down the center of the page when I copy only How do I fix this. I have changed the toner cartridge thinking in may have been the toner but it is still doing it

The black line is either coming from the toner cartridge or the transfer belt. You can usually see a line on the transfer belt if that is the cause. Just open the large fron door and look at the transfer belt that is mounted inside the door. If you can see a line of toner on it similar to what you see on the page then there is your cause. You can also look at the drum in the black toner cartridge to see if there is a line on it as well. That should elp you determie wether to change it or not. Are you using remainufactured toners or OEM HP?
Than You for using Fixya.
WheatlandServices

The toner drum has a scratch on it. The only fix is to replace the toner cartridge or the drum if it is separate from the toner.

The fuser is located in the back of the printer. I think it's held in by to screws. It's about hte same size as the toner cartridge. Please visit these websites.

This is the fuser kit.
http://store.printerprinciple.com/products/rm1-3044

The service repair manual.
http://www.scribd.com/doc/15253671/HP-Laserjet-3055-Repair-Manual

Fuser Replacement is on page 170.

Replace your drum unit.

I think you need to change the tranfer belt assm.
If all the colors are smearing .

Or all of your toners are bad and leaking,
Hope this helps

It sounds like a faulty toner cartridge.Try changing the cartridges and see if this solves the problem

Good morning Jean,
A mark that is three inches apart can either be the drum, which is part of your toner cartridge, or the fixing assembly, which heats the toner and makes it stick to the paper. With both problems you are describing it could be either of these. The easiest way to figure out which it could be would be to replace your toner and see if the problem persists or if the machine is fixed. If you rub you finger on the left side of the page where the problem is does the toner rub off? If this happens then the fixing assy needs to be replaced. It could also be a combination of both problems. If you replace the toner it could fix part of the problem or vice versa.
Hope this helps

Does this same thing happen if you just print a report out of it?

Here's the logic behind this.

If it happens on scanning or copying, but not on printing that's a problem with the scanning section.

If it happens on everything (scanning, printing etc) that's a problem with in the printer controls.

Usually on lasers, if it's printing related, the first thing to do is change the toner.
If the imaging drum (which is part of the toner cartridge) is damaged, it will leave lines down the page.
This is a fairly common problem on refilled toners.

If you have changed the toner, and it still does it, it's a different problem.

First try changing out the toner cartridges since it is the cheapest option. If this doesn't work check the fuser unit by opening the back door and see if there is a line worn down the miidle. One other option may be the transfer roller that sits under the toner cartridge. It may be worn.

you need to replace the chips so it will read the amount of pages printed by the toner cartridge.This chip is only for measuring how many pages printed.