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Make multiple copies of Jet black print for example, open the platen cover and then make blank copies.Print out will be jet black.After about 60 to 70 copies background will be adjusted, if not then replace the toner.After replacing the toner if the background is still there then you must replace the developer.
yes that it 's the most possibillity. but you must be assure that : - the paper is not moist. (it makes pale copies) - the glass has you cleaned up. (it makes black background uneven) - the transfer unit is not dirty. (it makes black background)
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.
When developer goes bad you use more toner for one thing, but the main sign is a gray background in your copy. The print should be black but appears to be gray. The ricoh 350/450 was always noted to leak toner and developer as it runs. Check your machine and see if you see any small piles of toner, which also has developer in it, in the machine. Ther are small seals made of felt that need to be replaced if you have this problem. These seals rub against the drum sides....Good luck.
sounds like faulty drum cleaning blade,which is usually contained in the replacement drum module.I would be inclined to take the drum unit back where you got it (unless you replaced it with a second-hand one) 99% certain the problem is contained in that module