Color LaserJet 2500n banded output

[TronCarter]

I don't know how better to describe the output than calling it color banding. It used to happen every once in a while, now it happens on every page. There are multiple colors involved and they change from page to page. Printing the engine test page also does the same thing, so I believe I can rule out the formatter. So far I have replaced all toners and the drum, and I also replaced the high voltage power supply and sub-high board. I think all that is left is the laser scanner and the dc controller. Has anyone seen anything like this before, or have any suggestions (besides throwing the printer away)?

Tron

[MichaelTech]

Yeah, Im for tossing them, but the carousel PCB is most likely the trouble.

[TronCarter]

I guess I don't know what the carousel PCB is. There is no mention of it in the repair manual. Here is the diagram of the PCA's:

[cs_steve]

My vote would be for swapping the DC controller ...
The only other suspicion would again be the toner cartridges -- I know you've replaced them once, I would just make sure you're using a reputable brand, and better yet would be to test those toners in another 2500 machine if possible , since it is very possible to get multiple problem toners from some vendors ...