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KeepItPrinting.com
The "unofficial' and "unauthorized" KIP info site.
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Krizzy
dreaming of medical school
Joined: 19 Feb 2013
Posts: 3
Location: Pittsburgh Pa
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 Posted: Wed Jan 28, 2015 11:04 pm Post subject: 7800 Color background in white area of all media |
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A am getting background of all colors in the white areas of an image, regardless of the media weight. even 24# bond looks bad. The humidity inside the machine is a moist 24%.
The print heads are clean, the wires have been replaced, and I have tried adjusting some of the bias voltages with little effect.
Hopefully there is a machine in a dry climate that can offer me some suggestions.
TIA |
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Pioneer007
dreaming of medical school
Joined: 24 Jan 2013
Posts: 9
Location: WA state
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| Posted: Fri Sep 25, 2015 10:37 pm Post subject: |
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Has your machine had the update kits done to all process units for back grounding? It's quite substantial. They also went to a finer grained toner with this update. Welcome to the kip C7800. Mine will slightly background in white areas 40# and above even with the mod....Normal!
These are nice machines, perhaps over marketed as the do all best of class but it has many areas where it's weak IMO. I've spent 4 years tweaking, adjusting, manipulating it, with some colors it's just not good at reproducing, I work both ends, software and hardware. |
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Techsense
medical school senior
Joined: 01 May 2009
Posts: 38
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| Posted: Sat Sep 26, 2015 9:35 am Post subject: |
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The sweet spot for humidity on the 7800 is 40%
Its a different machine if run in a 40% + environment
Check the fuser web, that can make a difference |
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p51d007
medical school grad
Joined: 01 Jun 2011
Posts: 98
Location: Springfield Missouri
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| Posted: Tue Sep 29, 2015 10:31 am Post subject: |
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Bump the humidity. When I first got involved with KIP about 7 years ago, it was a tough thing to get use to the fact they prefer higher humidity.
So much so, the client I have, I purchased a humidity/temperature gauge and mounted it on the machine to make sure they kept the humidity up.
Around 40% does seem to be the best range. When they moved into a new building this year, I talked them into inserting a moisture thingy into their heating/cooling system for the Kip room to keep the humidity stable, instead of using a humidifier.
_________________
39 years in the small format business, large format since 2009. Toshiba D.A.T.E. trainer. |
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dlee
doctor
Joined: 07 Nov 2006
Posts: 1459
Location: E. Syracuse NY
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| Posted: Tue Jan 29, 2019 11:26 am Post subject: |
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I know this is an old post but I'm currently getting a grainy haze on the entire page. The image looks great but the haze is throughout. I just checked the Internal Humidity and it is at 16%. I have a feeling this is the culprit especially since Techsense says that it works best at 40% humidity. Has there been any new discoveries/fixes on this since 2015?
As for the update kits for back grounding, I don't believe these have been done.
Any suggestions or confirmations that I need it at 40% or if the update kits WILL fix this issue? |
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