Pattern on prints shows up on black C454e

[Synthohol]

dont know if they would send anyone from PR but here are the authorized dealers from there, its the closest i could find.

Document Support, Inc.
Ave. Iturregui MM-7 Calle 420
Carolina, PR 00982
Contact: Israel Levi
Phone: 787-294-9663
Email: ilevi@dsincpr.com

IGM Corp.
Carretera 199 Km 1.2
Bo. Los Frailes
Guaynabo, PR 00969
Contact: Jose Irizarry
Phone: 787-622-0850
Email: jirizarry@igmpr.com

Caribbean Data Systems, Inc.

636 Av. San Patricio
San Juan, PR 00920
Contact: J. Mustelier
Phone: 787-774-6969
Email: jmustelier@caribbeandata.com

[positiveg]

dont know if they would send anyone from PR but here are the authorized dealers from there, its the closest i could find.

Document Support, Inc.
Ave. Iturregui MM-7 Calle 420
Carolina, PR 00982
Contact: Israel Levi
Phone: 787-294-9663
Email: ilevi@dsincpr.com

IGM Corp.
Carretera 199 Km 1.2
Bo. Los Frailes
Guaynabo, PR 00969
Contact: Jose Irizarry
Phone: 787-622-0850
Email: jirizarry@igmpr.com

Caribbean Data Systems, Inc.

636 Av. San Patricio
San Juan, PR 00920
Contact: J. Mustelier
Phone: 787-774-6969
Email: jmustelier@caribbeandata.com

thanks much
Yeah I'm sure they'll send a tech once you're willing to pay for it lol .
Think I've heard of Caribbean Data Sys, think they are HP dealers also.

[REGSIS]

Thanks to @Synthohol and others who really assisted
Well today i cleaned out the bushings, thanks again man for the illustration
And I added some dev powder back into the unit and I'm getting blacks
Don't know how long it may last but I'm hoping for the best till the main printer is back up and running then can take a good look at this one
Please see the scans of the print test
Attachment 47027
thanks again all

Good result!
Regarding the white bushing - worn one can cause c2557 abnormal low toner K density, but then machine will stop and (in theory) should not cause developer loss. K output will be faint as toner density will be 1% or 2%.
When you take out the bushing and look inside, you will see toner. In that case replace it. If it's clean then it's not necessary. Replace with modified ones - metal bearnig inside.

Regarding developer - permanent magnet on magnet roller should hold back developer, and bias voltage from HV board should hold back toner.
In theory HV board failure will result in solid black (or colour) image (no Vb or no Vg). It will not suck out developer. Voltages can be checked in State confirmation --》 Table number.
Only sparks from worn drums can take it out little by little.

Using OEM toner will recouperate developer and after few thousands prints brush on magnet roller will be perfect again.