Xerox 5305 copier excess toner

Those old babies just keep going! You need some serious TLC. And, a feed tire no doubt.

Could be a bad drum unit. Is the new toner cartridge a refilled? Remanufactured? or Brand New Xerox brand toner? If it is refilled or remanufactured I would run some copies and give it a chance to clear. Sometimes they end up with too much toner in the Developer mix and can be overtoned which causes a general background over the whole page. They should clear up as you run copies, say within 100 pages. Also try manually lightening the copy with the exposure control on the operation panel. If lightening the copy clears all of the background then you need to have the optics cleaned. There are 4 mirrors under the large original glass that need to be cleaned. If all this fails then you are looking at either drum unit or a defective or out of balance toner/developer cartridge.
Good Luck and Thank You for using Fixya.

It could be drum or toner cylinder.

If your ERU (drum unit) has made 40.000 copies you can repair it using the repair kit that includes the fuses.If it has reached 80.000 copies then you need to replace the drum.If you can't find either then take out the drum,locate the small pcb at the rear end (next to the gears) and replace the 2 small fuses.This requires a soldering iron and knowhow

It sounds like you are replacing the toner cartidges NOT the Drum Unit. Drum is located behind the toner cartidge and you will see it after removing toner. Pretty common mistake :)

Hello sir; That problem not caused by toner, is by drum cartridge, replace it will take care your problem.

Xerox Copy Drum Cartridge 13R83 / 6R737 (20000 Page Yield)
Xerox brand - works in Xerox XC 355 XC 356 5201 5203 5205 5210 5220 5222 5305 5306 PRice is 135.00.. Post response if you want link to site. This will cure your grounding problem. You Cannot fix it, It is a consumable item and has no serviceable parts

sounds like the drum leaking, replace drum or other possibility Fuser.

the 5305 was a portable copier and the paper tray attached to the platen cover (glass cover). It may be there. The device will not work without a paper tray. If it's been in the basement, you may need to make sure there are cartridges in it too before attempting to power it on. If there is not a toner cartridge, the device will not power on.

Are the lamps comming on, and on brightly? They may need replaced.
You may also have a bad ground contact to your drum cartridge.
Remove the cartridge and clean the contacts. The ground contact may also be worn out.
Those are the 2 most common problem with black copies on that machine