Black streak running through prints

[positiveg]

Re: Black streak running through prints

Ok I've gotten the new black drum and Cyan drum both genuine.but no change. In fact, I'm attaching some pics. One is colour the other same image black and white then a business card that background should be black

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[tulintron]

Re: Black streak running through prints

My humble opinion says that this is a problem in the development unit. Are you using genuine toner?
Is there any input in addition to working time?
The black development unit may have little revealing, causing these failures

[positiveg]

Re: Black streak running through prints

I just changed the unit. Bought a new unit installed two days ago. Guessing it should have genuine powder in there as well.
Could it be the IBT?

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[tsbservice]

Re: Black streak running through prints

I just changed the unit. Bought a new unit installed two days ago. Guessing it should have genuine powder in there as well.
Could it be the IBT?

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Looking at samples definitely K developer unit is depleted. Those machines can quickly empty developer into WTB if/when they decide to.