print quality tone in the middle bizhub c6500

[rodrigo neres]

Gentlemen, good morning


konica C6500


I have a problem a few weeks. tone in the middle (yellow) density of 85% in overall profile of the output command workstation, generates some yellowish stains me like a drained by the image.


ja sent as line 1, 2; dot 1 and 2 and the problem persists.


put images in Annex 2. I do not know if the picture to identify.




cylinders 35%
developer 65% (developer (powdered)
coronas 5%transfer belt 60%



20121118_101132.jpg



20121118_101111.jpg




adjustments performed:


1 - User setting total
2 - auto adjust gamma sensor (manager mode)
3 - toner density auto adjust, print quality, auto gamma adjustment,
4 - new cylinder - initial drum rotation
5 - exchange kit 200k and 100k
6 - use EFI expectometro 1000, already calibrated several times -
7 - moved to place the cylinders
8 - swapped paper because the fiber
9 - including standard recall new date and recalibration.






others, faithfully follow the directions of the transfer roller as technical manual (electronic contact side).




thank tips

[Mick01]

Re: print quality tone in the middle bizhub c6500

Try printing test pattern 53
output sheet with test pattern 53 Yellow set to 120 all others at 0
output sheet with test pattern 53 Magenta set to 120 all others at 0
output sheet with test pattern 53 Cyan set to 120 all others at 0
output sheet with test pattern 53 Black set to 120 all others at 0

Inspect these four sheets for uneven density. Looking at your samples i would suspect yellow devewloping unit fault
Hope that helps

[rodrigo neres]

Re: print quality tone in the middle bizhub c6500

thank you

tomorrow and you'll notice these tests.

[Mick01]

Re: print quality tone in the middle bizhub c6500

Hi,
One more tip that i used to use when trying to diagnose this fault is to use the Eye One share program (with an ES1000 or eye one spectro). I would measure the centre, and the edges of the test pages (in the main scan direction) and measure the delta e values at these points. It is sometimes difficult to diagnose by eye when evaluating these test patterns (especially yellow).

[rodrigo neres]

Re: print quality tone in the middle bizhub c6500

hello Mick


as his tip, did the tests in halftone machine. everything went perfect!
passed to the second stage (Fiery pro80) = formatted the same system, solved!


probably had something corrupt in the system.


I appreciate the tip. Thanks
sorry for the English, do not have much practice, use google translate and help.


thank you friend

[Mick01]

Re: print quality tone in the middle bizhub c6500

Happy to help. Glad you resolved the issue.

[rodrigo neres]

Re: print quality tone in the middle bizhub c6500

thank you