TA 2552ci loss of color

[BillyCarpenter]

I purchased a couple of 2552ci's and on one of them I have complete loss of yellow (I toned it up and got some yellow coverage) and the cyan has random white spots. This machine has 91k on the black and 28k for color.


This is my first time working on this model but I think I know what's causing the problem. I believe the yellow DV unit is depleted of developer and to a lessor degree the same for the cyan DV unit.


If my suspicion is correct, my question is why are the DV units being depleted? I thought that maybe someone swapped the DV units before returning it back to the leasing company but it shows these are the original DV units.

PS - I inspected the DV units and there's a lack of developer on the mag roller.

See attached images.


yellow dv.pdf

[copiertec]

Have you read this post?

Kyocera Taskalfa 2552ci - Yellow color is missing on status page

[KYO_OEM]

hi Billy,

look at the production date: "66" means 2016/ june
5 years old system with 24k color printouts only.
I think the dev powder will be "dead"/ destroyed...
What happens if you run developer refresh by system menue?

[BillyCarpenter]

hi Billy,

look at the production date: "66" means 2016/ june
5 years old system with 24k color printouts only.
I think the dev powder will be "dead"/ destroyed...
What happens if you run developer refresh by system menue?

Hi, KYO

The yellow page was completely blank at first and when I ran DV refresh I got those yellow bands that are in the picture that I posted. When I inspected the Y DV, I can see that same pattern on the mag roller. I replaced with another Y DV unit and it works fine.

I was wondering why the yellow DV unit was depleted? You think it's because of age? I will order a new yellow DV unit.

[BillyCarpenter]

Have you read this post?

Kyocera Taskalfa 2552ci - Yellow color is missing on status page

Thanks but I have drive to the DV unit.

[blackcat4866]

Yes, that diagonal pattern of voids is an indicator of developer depletion. And yes, 5 year old lightly used developer can deplete.

The cyan is a primary charge issue. You can see the streaks crossfeed where cleaning was attempted, and the spots at 37.5mm intervals which are likely lumps in the charge roller. Be sure to reset the charge counter when you change it, or you can get charge errors. =^..^=

[tmaged]

You can try changing U325 Mode 1 to Mode 2 with new DV-Unit. Mode 2 has mini DV-Refresh after sleep mode. DV- refresh can keep toner charge level even.
Most of the time it's caused by low volume color prints. The color DV gets a charge, but doesn't get used. After happening continually, the DV sticks to the mag roller. It usually isn't too much of an issue, though.

[KYO_OEM]

i don`t think it`s charge issue because of white spots and not beginning at leading edge
Looks like magnetic roller circumference.

But let me try to explain why yellow DV is broken
It`s 2 component DV
Developer + Toner
Developer = metallic powder / "easy explanation"
Toner ingredients = color, wax, amorhes silicium dioxid + others
If we have long time running from DV without adding enough toner you get stress for the develoer powder and the circumference from developer will decrease because of not enough toner + silicium will be added.
wax + silizium is working like a "grease" for the developer powder.
Without "grease" the developer powder would destroyed
Between (+) and (-) magnetic pols on the magnet roller we get "toner bags", inside we will have enough needed toner in good condition.
If we have dev with decreased dev powder circumference, the high from the "bags" will decrease and we get faint color because of not enough toner inside anymore....
Check service status page and see which consumption would run.
My experience: consumption < 2% and you can get more stress for developer powder

[BillyCarpenter]

i don`t think it`s charge issue because of white spots and not beginning at leading edge
Looks like magnetic roller circumference.

But let me try to explain why yellow DV is broken
It`s 2 component DV
Developer + Toner
Developer = metallic powder / "easy explanation"
Toner ingredients = color, wax, amorhes silicium dioxid + others
If we have long time running from DV without adding enough toner you get stress for the develoer powder and the circumference from developer will decrease because of not enough toner + silicium will be added.
wax + silizium is working like a "grease" for the developer powder.
Without "grease" the developer powder would destroyed
Between (+) and (-) magnetic pols on the magnet roller we get "toner bags", inside we will have enough needed toner in good condition.
If we have dev with decreased dev powder circumference, the high from the "bags" will decrease and we get faint color because of not enough toner inside anymore....
Check service status page and see which consumption would run.
My experience: consumption < 2% and you can get more stress for developer powder

Thanks KYO. I think you've explained this to me before. I'll have to check back through my notes. Thanks again.


EDIT: Yes, I have it in my notes. I remember now. The DV unit drive time is running and no toner is being added = stress on DV. And I think this normally happens when the customer is printing mostly black pages??

[BillyCarpenter]

You can try changing U325 Mode 1 to Mode 2 with new DV-Unit. Mode 2 has mini DV-Refresh after sleep mode. DV- refresh can keep toner charge level even.
Most of the time it's caused by low volume color prints. The color DV gets a charge, but doesn't get used. After happening continually, the DV sticks to the mag roller. It usually isn't too much of an issue, though.

Thanks. I'll be sure to do that. Thank you.