Has anyone had a problem with blue background on copy/scans ONLY when using the DP? Got one and tried everything I know, including replacing the DP, no joy. Prints are fine, copies off the glass are fine. It originally had a DP760, and I swapped in a dp750, with no change.

Did you try playing with U063 shading position? It solved a similar problem with the C4035E series.

There is a calibration kit for the DFs. I have used it once before and solved my problem. The kit consists of 3 charts 2 color and 1 gray.

Scanner home position being knocked out of place will cause this. The scanner will scan off the glass with a slight variation in lead edge, may not notice it but when the scanner moves to the ADF position the scanner is out of place enough that the light refraction reflects the 480ish nm wavelength (blue).
Z

Ive had this a couple of times Try sim 68, adjust a few clicks up or down.

Do you have a part # for the calibration kit?

Ughhh,,... nevermind, yes i tried sim 68, in the end, Version 9 software fixed it. Something must have corrupted the ver 8 it had.

Gallivan-shop look in the SM DP750-760 book at U411 description. It gives the adjustment procedures and Test Charts to be used. Page 1-3-16.
The kit i was given may be a collection of the charts.

PS dont run the U411 without the charts, bad news, but can be set back with U22

Thanks Copymech for the info