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this is a typical problem.. this printer uses a carasol meaning that the toners are riding on a carasol there are 2 white gears that drive the carasol 1 on the right and one on the left. Half page fade is almost always a misaligned carousel! A Tech is needed or a service manual here is a link for the manual http://www.partshere.com/Models/Q3948A/CLJ_2820_Removal_replacement.pdf
look at figure 5-78 Removing the print-cartridge carousel you will see the white gears im talking about
Common on this type print engine. Your carousel is out of index. Repair requires removing all toner cartridges and printer covers. Big black carousel gears have index marks, one on each side. Trip the solenoid carousel brake at the top left of the rotary drive assembly by lifting the solenoid flap to free manual carousel rotation. Bring the yellow slot to the front, facing you to achieve rough indexing. Look for the two white pins of the white carousel drive gear, one pair on each side. Rotate the carousel to where the two pins, which face inward, are at the bottom. The mark of the carousel gear should be between the two white pins. Chances are it is a tooth or two out of index on one side. To reindex, push the black carousel gear inward and the white drive gear outward to skip a tooth. Recheck, reassembly, and have fun.
the carousel gears are out of sync - "off a tooth" and have to be realigned. i spent 3 days last week fixing this problem - it's quite a job, to say the least. my question - if you ever check for this answer - is: what were the circumstances when the problem first occurred? just after replacing a toner cartridge? if so, was it recycled cartridge?