My phaser 8600 when printing it prints very blurry i has plenty of ink and i replaced the cleaning kit on the side

The cause of the blurry prints is that oil, from the maintenance kit, has leaked onto the drum encoder assembly. The drum encoder is responisble for position the Y-Axis or vertical direction of the print. The oil on the encoder is making the printer incorrectly position the drum as the pinthead is spray ink onto it, thus you get a blurry print. If you look closely, letters probably have a downward jag to them.
There are two ways to fix this. The cheapest and easiest method is to remove the right side cover, then the fan on the right. Behind that fan is the drum encoder wheel. Using a lint free cloth and isopropyl alchol (preferably 99%), clean all the oil off of the sensor disc. This method might work for a while, but the problem will ussually come back.

The second method would be to just replace the drum assembly. The drum assembly comes with a new encoder disc.
The display (menu screen) can easily be fixed by replacing the control panel (part# 848K06552). It's pretty simple to replace w/ no tools required. Here is video to show you how.

You don't clean the drum. You either need to replace your maintenance kit , or my better guess is your using generic ink sticks and you need to use the sticks xerox makes for the machine.
The problem is that your not getting effective cleaning from you maintanance kit

Quite possibly, your Wave Amp board has failed. If so, it is more cost effective to purchase a new printer than to repair yours unless you can find used parts.

Currently, Xerox is offering a trade-up rebate on new solid ink printers.

If you remove the right side cover, locate the drum shaft about midway back and midway up.
There is an encoder on the end of that shaft. Remove it and clean it with some alcohol. Don't be afraid to flush it a few times. Let it dry and reinstall it. It get's contaminated with the silicon oil from the maintenance kit and causes a very blurry print because the drum runs the wrong speed.
That may need replaced, but the vast majority of the time, cleaning the encoder resolves that problem.

If all that did not work, then you need a print head. They are pretty exoensive, If you purchase one from Xerox it will be in the 700 dollar range. You can look for secondatry markets, but I am not sure who they would be for Phaser solid ink printers.
The dry ink, ( poweder) ink phasers make better prints than the solid ink printers now. I would look into one of those if you are looking for exceptioinal print quality with a much more reasonable cost factor.
They have developed an ink where the particles align, The quality is remarkable.

Appropriate cleaning procedures, as listed in the following tables, should be
performed when specific print-quality or paper transport problems occur.
All cleaning procedures are detailed in the printer’s Phaser 8400 Reference Guide or
the Phaser 8500/8550 User’s Guide.
Light Stripes or Missing Colors
Problem type Solution
Missing or light-colored
stripes on prints.
Select the automated procedure Eliminate Light Stripes from
the Control Panel.
Ink Smears, Oil Spots, or Random Ink Streaks
Problem type Solution
Ink smears on the front,
back, or edges of a page.
Select the automated procedure Remove Print Smears from
the Control Panel.
Check the maintenance kit for ink and paper-dust build-up on
the wiper blade.
Oil (drum fluid) on top edge
of print.
Select the automated procedure Remove Print Smears from
the Control Panel.

Hope this helps
pdouglasss

What is happening is your print head is not moving properly. The 2 most likely problems are these.
Since you mention the maintence kit and tray will not come out I suspect the first.
What happens is if the printer is not sitting level, both front to back and side to side, ink will seep down the print head and get into the print head pivot block. If you remove the covers that block is a 1 inch by 1 inch stainless steel block. located on the left side of the machine, ( looking from the front). It is located about 2/3rd of the way back on the lower part of the frame. Take a look at it, you will probably see yellow ink contamination in the block. You may have to use a pair of chennel lock pliers to remove it, but once removed you need to soak it in warm water to easily clean it. clean the block, the shaft that runs through it and remove the excess ink spilled into the machine. Honestly the easiest way to do that is to remove the print head. If you need to go that far let me know if you want to remove it and I will send directions.
Secondly the print head wiper blade could be tacked to the print head. That will happen if you shut the machine doen improperly, or if there is a power failure or the machine is being unplugged instead of shut down. That would require the removal of the ink loader, ( where you add the ink sticks) to access the print head / drum area. You can then gently detack the blade from the print head. Then run the cleaning cycle.

There is an encoder on teh drum motor that picks up lubricant from the maintenance kit and causes those blurs. It eneeds cleaned or replaced

Most likely the drum encoder has picked up lubricant from the maintenance kit. If you remove the right side cover it is on the end of the drum shaft. Normally cleaning that well resolves blurrs.
The drum itself may not getting perfectly into print position either. A cable hanging it up just a little to far from the drum.
But most likely the encoder needs cleaned. Possibly replaced.

I had a similar problem. I discovered that the imaging drum was too hot. There is a temperature sensor that rides on the drum surface to monitor the temperature. You can see it if you lift the exit cover on the right side. The sensor is white, and has a thin probe which rides on the drum surface. There's a single screw accessible from the right side which holds it in place. A hole on that side will allow a screwdriver (torx) to access the screw and the little unit can be removed (be patient- it can be done!). Clean the probe with some alcohol and replace it. The problem is caused when the ink on the drum smears because it's too hot. Dirt (wax and oil)under the sensor probe prevents contact with the drum, and makes the printer think the drum is too cold.