I have an HP 4050N Laser Printer. I just replaced the fuser unit and the rollers. The pages are printing with a hazy toner line down the right side of the page. The page is readible, but looks bad. Any suggestions?

If it's a spotty line, that most likely points to the fuser. Maybe something tore the belt or scratched the roller in there.

I was going to suggest removing the fuser and looking at the rollers, but on this printer it's a major operation.
Instead let's run the half test. Put paper in the manual feed tray(tray 1). Print to the printer. When the sheet of paper gets pulled about 3/4 of the way in, open the top cover. Pull out the toner cartridge. Look down at the paper. Does it have a streak down the right side? If yes, replace the toner, if no, have the fuser replaced.

I had replaced the fuser - no improvement. I removed the fuser, imaging unit & transfer roller. CAREFULLY using a vacuum cleaner I cleaned all units and the internals of the printer, rotating the roller on the imaging unit to clean all parts. (Warning Place Imaging unit on paper as toner escapes) After a few test prints the page cleared and duplicate ghosting cleared.

Hello,

Both of these problems are caused by a defective fuser unit in the printer. This is a user replaceable part. The part number is RG5-2661. You should be able to get one on Ebay.

I hope this helps, if so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com
[email protected]

Hello

This is a common issue when excess toner is inside the printer and gets on the Fuser roller. Once there, every page that is printed gets the same imprint. Sometimes it is text from a previous page - others are lines like you are seeing.

You will need to get a Maintenance Kit for your printer. This will replace most of the rollers and the Fuser - where the actual problem is.

Here is the part list from Lexmark -
http://www.lexmark.com/lexmark/product/home/1005/0,6970,239619818_653293751_1231984621_en,00.html?tabId=1

It looks like the kit will cost around $170.
http://www.fastprinters.com/ProductDetails.asp?product_id=LEX-40X2847

If you are handy - you may be able to remove the fuser assembly and wipe the excess toner from the rollers. This may or may not work - depending on how much toner is on the fuser and how long it has been there.
-

One of 2 things is defective. The toner or the fuser. Take off the rear door and look at the 2 large rollers. (One is orange on those models I believe.) See if the defect can be seen on the fuser.

Refer to the following table
Cause
Solution
How common*
Contamination in the laser path
1. Clean the laser path. (Remove the laser/scanner assembly and clean the lens.) 2. Replace the laser/scanner assembly
8
Defective fuser.
Replace the fuser assembly
3
Lack of toner or faulty toner cartridge.
Redistribute the toner in the toner cartridge. If the problem continues, replace the toner cartridge.
7

If you can rub the toner off the paper it is the fuser.

fuser, the part of a laser printer that melts the toner onto the
medium. It consists of a hot roller and a back-up roller. After toner
is transferred to the paper, the fuser applies heat and pressure to
ensure that the toner stays on the paper permanently. This is why
paper is warm when it comes out of a laser printer.

For toner problem:

Do a half test as follows -
Print one sheet from the fold down tray, just as the trailing edge of the paper
goes into the printer open the toner door to stop the printer. Remove the toner
cartridge, are the marks on the paper that you can see in the printer? If they
are there the cartridge needs replacing.

Run a half test. Start printing a few pages, as it prints open the cover, remove the toner and look down at the paper. Does it have lines on the right side? If yes - replace the toner cartridge.

Toner issue getting to drum - use gen toner cart.

or Drum blade stuffed (lines are down page fro top to bottom- replace drum assy

Drum has been exposed to light faint or blank across copies repeated 4 times down page - replace drum assy

or upper fuser roller stuffed, down page, smudgy print -  replace fuser

LSU(laser) or boards rarely cause issues