Riso RP: irregular lines in master (white and black)

[jeh]

Hello,

I've been having this problem since a long time now, but I'm having either black (or colored) lines or white lines in images I scan from the glass plate (always worked like that) on my Riso RP3105ep. I tried resetting, cleaning the thermal head (which would be the obvious cause), tried scanning in as duo or as photo, at 101%, with less contrast.. I have the feeling that it mostly occurs with certain percentages of gray, so not in really dark images or full surfaces. It also is in different places depending on the image, even though I also have one small line that's always there on all drums at exactly the same spot (so that would be because of the thermal head). I've attached some examples. Any clue would be very much appreciated. Thanks for reading.

[jermyth]

Have you tried any test mode prints? elimination of all scaning and optical components.

[jeh]

Thanks for the tip, jermyth, just did Test Print F (dots 2 + cross stripes), everything looks perfect, nice square black dots and full thin lines. Even the short line I mentioned in my original post that I mostly have on all prints/drums is not visible on this one. Don't know if any of the other test prints are more suited for this?

[chinxxx]

Thanks, in advance, for any info.






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[jermyth]

Sorry for the delay, sounds like something in the optics either mirrors or the CCD or cable from CCD to main PCB.
Good luck.