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]

Re: TA 2552ci loss of color

Have you read this post?

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

[KYO_OEM]

Re: TA 2552ci loss of color

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]

Re: TA 2552ci loss of color

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]

Re: TA 2552ci loss of color

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]

Re: TA 2552ci loss of color

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]

Re: TA 2552ci loss of color

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]

Re: TA 2552ci loss of color

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]

Re: TA 2552ci loss of color

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]

Re: TA 2552ci loss of color

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.

[BillyCarpenter]

Re: TA 2552ci loss of color

I must find a better system for organizing all of my notes.


KYO explained this problem to me months ago. It's very interesting.







From KYO_OEM

[PrintWhisperer]

Re: TA 2552ci loss of color

....
It`s 2 component DV
Developer + Toner
Developer = metallic powder / "easy explanation"
Toner ingredients = color, wax, amorhes silicium dioxid + others
....

Can you confirm this is specific to the low speed Dual Component and not accurate for hybrid C.A.S.S. machines?

Or is carrier auto streaming not meaning what it says.

Thanks

[KYO_OEM]

Re: TA 2552ci loss of color

C.A.S.S. we have had on Alphard series only.
Not longer existing, or do you remeber to open the cass shutters on Iris 1+2 high series?
Alphard series used touch down developing only instead of dual component developing.

[PrintWhisperer]

Re: TA 2552ci loss of color

C.A.S.S. we have had on Alphard series only.
Not longer existing, or do you remeber to open the cass shutters on Iris 1+2 high series?
Alphard series used touch down developing only instead of dual component developing.

Perhaps you are not understanding me, let me clarify (I am only trying to get facts which may not be properly understood here)

I am asking if toner is pre-mixed with carrier as has been asserted by Dallas, TX training material (below)

All (kyo-console) developers are dual component. The only difference is hybrid DV 'point of contact' uses mono component. Saying 'all Alphard used (anything) instead of dual component' is not accurate.

Alphard was CASS only (hybrid DV) because simple (1-roller) Dual component system was not introduced into the 2 lowest speed models of Alphard, but is now.

SO since construction of hybrid developers has not changed since Alphard, are you saying that toner composition is different for later hybrid models and does not comply to information below:

DV.jpg

Because developers now eject waste constantly (with DV drive) then if no additional carrier is ever supplied then DV must retain all initial carrier on MAG roller?

I hope you understand this is an important point of clarification.

[fishleg]

Re: TA 2552ci loss of color

I wish they would put it like Konicas so it would only stabilise colour when colour is actually used if you set it to black priority. I go to loads of places that have totally locked down colour so it's impossible to use but the machine still does a full colour calib wasting toner and dev... Argument would be buy a mono machine but sales people love to sell colour.

I've been setting a lot to U486 mode1 which seems to make it do colour calibs less. Any other tweaks to get the max out of the colour Dev in that scenario with no colour usage? I suppose if they don't turn they seize up so you can't win and I have seen a machine do that from no colour usage all 3 drum blades decided to flip.