Xerox quality gud but when i print from pc then left side of print is faint i will try diffrent frivers for pc

Try this link:

https://www.support.xerox.com/support/phaser-6110/support/enus.html

First of all replace the tonner with new one. Try to clean the rollers too.
If you wish to get some help then check the link below
http://electro-medical.blogspot.com/

Canon is always bettee than xerox in print/ copy quality

try to clean the laserwindows of the printer.

Problem on your printer fixing unit.Its muddy in wast toner.Need service this printer.I hope fix your problem

try MCF 8460 all in one. it cheaper and easy to operate

This sounds like the doctor blade within the black developer unit inside the image unit has become contaminated. This means that not enough black toner will be attracted to the developer roller. This usually manifests itself as feint thin lines of print running vertically through the text being printed. This can be repaired and is a known issue with this image unit.
If the printer is in warranty tell them you want it replaced, if not then take the image unit back to the supplier you bought it from and demand a replacement.

Try cleaning the LED heads. These are located in the lid and are facing you when you have raised the lid. A quick wipe with a dry cloth or tissue should help. If in doubt, check the user manual.

First I would suggest performing any head alignment functions with your printer's menu to be sure you have the stepper motor feed adjusted properly. Use the paper you are currently printing on for this procedure so that the thickness of that paper is factored in.
If you stil see the banding after doing this, you can use the Advanced Media Control button under Printer Settings in ColorBurst to fine-tune the paper feed adjustment. Print out the "Media Advance.tif" target (located in the ColorBurst/images & Targets folder) to use as a guide. For white bands, you'll need to enter a negative number (to shorten the paper feed).

When either printing or xerox is faint or leaving pages blank in between then your cartridge is almost empty. Get it refilled.