White Horizontal Chaotic Strips-gaps (Bizhub C227)

[staraseko]

IMG_20240326_191111000.jpg

Interrupted printing on an A3 sheet (most of it is unfused, so there is not much black there):
IMG_20240326_191202000.jpg

[kingarthur]

Re: White Horizontal Chaotic Strips-gaps (Bizhub C227)

it looks to me like you have dirty printheads, all of the colour ones need cleaning. the reason why the "black" has strips when printing in colour, is because it's using all the colours to make the black

[Gift]

Re: White Horizontal Chaotic Strips-gaps (Bizhub C227)

Looks like HV fluctuations / issues - might be caused by worn out/defective consumables or bad contacts.
It's not unusual that one issue can sort of backfire over multiple colors since some HV voltage generators provide multiple units.

[staraseko]

Re: White Horizontal Chaotic Strips-gaps (Bizhub C227)

it looks to me like you have dirty printheads, all of the colour ones need cleaning. the reason why the "black" has strips when printing in colour, is because it's using all the colours to make the black

Do you mean laser glass? Of course, it is first that I did: cleaned up all laser glass. But dirty laser makes white strips ALONG paper path, and we have ACROSS.

Black uses all colors, INCLUDE BLACK toner. My black has gaps, in which I see yellow or magenta color, that's why black toner has his own gaps. (which are absent in B&W printing)
And! Black colors are generally white in "general gaps" (which also are absent in B&W printring).
Gaps are along ALL 4 colors (!)
I can't understand it.

[staraseko]

Re: White Horizontal Chaotic Strips-gaps (Bizhub C227)

Looks like HV fluctuations / issues - might be caused by worn out/defective consumables or bad contacts.
It's not unusual that one issue can sort of backfire over multiple colors since some HV voltage generators provide multiple units.

This is very similar to the truth. I've noticed that one bad contact in drum-unit of ONE color can affect ALL colors in unpredictable ways. It's because of HV fluctations.
Firstly I will disassemble all drum-units to clean all contacts and write down result. And then will go to HV contacts. Thanks! It is good idea.