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Eugene74
07-03-2012, 12:35 PM
Hi all,

I've got a B421 it's about 2 years old and got 750K copies on. Drum live is at 13K and developer is at 50K. Suddenly it started to give me background only on double side prints/copies. Single side is absolutely clean. I have cleaned the corona units, adjusted dev bias, tranfer charges, grid voltages, well basically everything in the image processing section of tech rep settings. I even ran black copies to see if it wasn't overtoning, but no luck. It didn't made a difference.

Could anybody please assist me, or point me in a direction I havn't look before.

Would really appreciate it.


Kind Regards
Eugene

KM7155
07-03-2012, 01:38 PM
i have a B501, same problem with u, but the dev life is around 200k, i change the dev.
problem solved.

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