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Blotchy printing on WorkCenter 6605

I have a WorkCentre 6605DN. It works fine most of the time, but when I try to print pages with lots of solid black (1 colour, not 4), the print comes out with a mottled pattern - what I could only describe as a 'mackerel' pattern. The prints get gradually paler, until the printer pauses for a moment (to refill the ink?), then comes back with stronger black (but still not full coverage). The paler parts don't seem to be properly fused to the paper, and the print has quite a rough texture. I've cleaned everything I can think of to clean in the printer, and updated to the latest firmware, with no joy. I've tried three different black toner carts, and the Imaging Unit, Fuser and Transfer Belt Unit are all running at at least 80%.

 

Any idea why this is happening, and/or how to fix it?

 

I'm using a Mac, running OS 10.12.6

 

thanks

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Community Manager
Community Manager

Re: Blotchy printing on WorkCenter 6605

Hi timo1,

Thank you for using the Support Forum. Please take a look at the solutions for blotchy images.  If these solutions do not help please consider contacting your support centre for further assistance.

Thanks,
CherylO-Xerox
Community Manager

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