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Quality Testing...

kdw75

Well-known member
I was running some flyers on our 560 for a customer that is picky about their colors and noticed mid-way through the run that the colors shifted noticeably. I was able to do a calibration and get through the run. Then afterwards I ran some solid fill sheets in CMYK and found that our cyan and magenta units were splotchy and very uneven side-to-side. Turns out that our developer units were almost empty and our tech said he is going to replace the 4 housings and refill them.

Just like they did on our Workcentre, the tech blamed the fact that we run extremely heavy coverage work. Oddly enough it started having developer issues around a quarter million impressions, just like our 560.

It makes me think that running solid fill sheets every morning along with calibrating might be worth it to detect problems like this as they are starting.
 
I run 20% halftone CMYK sheets to check the corotron(s) and then solid CMYK to check the drums/developer. Issues that look fine in one hide in the other.
 
After running these digital machines you start realizing they aren't as simple as one might think. To get good results they need a knowledgable operator finessing them.
 

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