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Love Konica
06-23-2014, 06:52 AM
Hi all,

Customer 's machine prints with yellow color on every print sheets, please see the upload image. I have changed drum and corona but nothing changes.
25408
when I print test page, every thing is ok
25409

Please help me, thank you.

methogod
06-23-2014, 02:06 PM
looks like your printing black and white in color...

make sure rich black is not turned on in the advanced setting.

IF you have rich black on in a grey scale photo you may get some fine registration marks off base....

also Konica use yellow for color registration.

are you printing from a computer, or right from the rip using a pdf workflow???

Love Konica
06-23-2014, 02:42 PM
Thank methogod, my file is not B&W, yellow approximate 15-20%, even when I print color file the yellow still appears.

I print directly from a computer (to rip), not using workflow.

Thank you.

Love Konica
06-25-2014, 06:15 PM
Any more ideas, help me please. Thanks in advance.

KM1Amsterdam
06-27-2014, 11:45 PM
Toner from the developing cylinder is actually touching the Y drum. Increase the space between the drum and developing unit. Decrease the size of the developing brush, adjust the skimming blades gap.

KM1Amsterdam
06-29-2014, 10:34 AM
U could try to increase the gap, by putting some tape around the 2 wheels left en right of the developer roll. It pushes the drum a tenth of a mm away.

Love Konica
06-29-2014, 12:11 PM
U could try to increase the gap, by putting some tape around the 2 wheels left en right of the developer roll. It pushes the drum a tenth of a mm away.
Thank you, I have tried your way. It take a good results. Thanks all, especially KM1Amsterdam.
Hope everyone who has this case can read this thread.

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