KM C280 print quality problem

[Lakatom]

Hello there,
By default, the printer does the following problem:
1-page-001.jpg
If i swap the Cyan drum for Magenta drum:
2-page-001.jpg
i don't understand the logic, could anyone explain?
Yours sincerely, Lakatom

[CP-1015]

Re: KM C280 print quality problem

How are the Level Histroy values for cyan and yellow?
If ok new blades for cyan and yellow else new drums.

[wjurls]

Re: KM C280 print quality problem

What are the drum counts? Are they near or past yield?

[Hishamawada]

Re: KM C280 print quality problem

As mentioned before , it's a drum issue .
For yellow it seems only a drum blade issue
Cyan seems a drum issue. If you want u can try adjusting the background level or adjust the primary transfer voltage. it might give you more time before u change it

Sent from my SM-G610F using Tapatalk

[Synthohol]

Re: KM C280 print quality problem

I beg to differ, the cyan dv is shot. Look at the diagonal voids on cyan blocks.
Maybe a yellow drum issue too but the cyan dv unit definitely needs to be replaced.

[tsbservice]

Re: KM C280 print quality problem

Print halftone test patterns from service mode at some diferent densities. That would expose faulty parts.

[Lakatom]

Re: KM C280 print quality problem

level hirtory.jpg
Cyan got a new blade for a month, but the corona unit have a "foil", its cr*p, i don't know if that could be a problem.

How are the Level Histroy values for cyan and yellow?
If ok new blades for cyan and yellow else new drums.

[Lakatom]

Re: KM C280 print quality problem

45-50%

What are the drum counts? Are they near or past yield?

[Lakatom]

Re: KM C280 print quality problem

https://imgur.com/1LXhCTN
https://imgur.com/tG424HO
https://imgur.com/74caMs6
https://imgur.com/HG7ulwk
https://imgur.com/RUZQEtT
I could not change the density

Print halftone test patterns from service mode at some diferent densities. That would expose faulty parts.

[tsbservice]

Re: KM C280 print quality problem

https://imgur.com/1LXhCTN
https://imgur.com/tG424HO
https://imgur.com/74caMs6
https://imgur.com/HG7ulwk
https://imgur.com/RUZQEtT
I could not change the density

Hit the clear button and then choose 128 with keys.

[Hishamawada]

Re: KM C280 print quality problem

According to ur photos , since the cyan drum is on magenta now , then its a drum issue (the drum itself).

The yellow lines if not visible on the yellow prints as white lines then its a blade issue.

As i stated before u might play around the magenta drum . Better swap it on yellow and if issue is still visible on prints adjust the background and primary voltage.

Sent from my SM-G610F using Tapatalk

[Synthohol]

Re: KM C280 print quality problem

Always print the cmyk gradation test pages. All 4.
So much more revealing of issues.
1 black pattern unfortunately does not help with a color problem.

[blackcat4866]

Re: KM C280 print quality problem

Try this set of originals:

=^..^=

[CP-1015]

Re: KM C280 print quality problem

[ATTACH=CONFIG]48378[/ATTACH]
Cyan got a new blade for a month, but the corona unit have a "foil", its cr*p, i don't know if that could be a problem.

And table number?