My employer is having same problem with several printers across the network. I just found this page at Kyocera's site http://www.kyoceramita.com.au/cs_paper_spec.asp which says a lot about the type of paper to be used to avoid problems but the one which leaped off the page to me was this:
"Glossy paper or coated paper may suffer from grey background print." We all point fingers at the toner, drums, printers but it seems like the paper is a more likely culprit. I haven't tested this solution but though I would post it anyway. Even if it doesn't solve my problem, maybe it will solve yours.
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Go to the print driver, properties, device settings, PDL. Hit the drop down box and select PCL5. Try this first.
You could have bad toner in it. Is it OEM?
It is possible to take off the side panels on the Process unit, release the tension springs on both sides and crack open the unit. You have to remove the corona,take off the bias board and slide out the drum shaft. Vacuum out the unit and clean off the mag roller. Toner stuck on the mag roller can also do this. Once toner has adhered to the mag roller, all you can do is clean it off with a solvent....or replace it. This is "not" easy to do. I only suggest trying this, if you have done cartridges before.
try to clean the printer from smeared tonner and the transfer.
the grey print could be as a result of printing using application sofware. make sure the tonner economy mode is not active form the application software,if it was turn it off and save, then reprint.
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you most likely will need to replace the magenta developer...
you prob dont' need a tech to do this..
these machines get very dirty..
take out all the toners.
underneath the toners is the developers.
there is a connector on the right hand side ..take out the connector
than pinch both grey tabs together and pull up and out the magenta developer... clean the magenta develop (vaccum out) or replace it
You say there are colors in the box but the 3800 is not a color printer. If it is one of the desktop color printers there is a setting change that may help. It is a service mode setting called "T7". If you print documents that don't use much toner this setting will reduce what is dumped in the bottle during operation. If you call the Kyocera End User Help Desk they can remote in and make the change if they think it will help. 800-255-6482
The Developer unit needs to be replaced. It gives background over entire page. If the printer is under 3 years old and is original unit (developer unit) you can get a new one free from Kyocera. Very good warr. from them. Phone number is 1 800438 6482 prompt 2 ; # for the part DV-62. Have your serial # and a status page with you. I work on Kyocera FS printers. Good luck. Russ