New Bizhub C8000 Printing quality big problem

[djchampion]

Has the tech tried to adjust the AC and DC transfer adjust timing lead and trail edge, looks like the transfer voltage is switching off before paper edge reaches transfer belt.

My plan is to ask in this matter. thanks for suggestion

[djchampion]

Try change the Lower Belt Unit on the Fusing Unit with the new one.

they tried.

yesterday service has changed lover transfer and upper. and first transfer barrel.

no effect

[kalindd]

they tried.

yesterday service has changed lover transfer and upper. and first transfer barrel.

no effect

Can you tell me, is this ( the defect) is on the lead edge, trail edge or on the side edge/edges?.
Correct me if I'm wrong, but it is on inner side (back of the machine) of the paper, am I right?

[djchampion]

Can you tell me, is this ( the defect) is on the lead edge, trail edge or on the side edge/edges?.
Correct me if I'm wrong, but it is on inner side (back of the machine) of the paper, am I right?

Yes Yes

the upper edge of print. Or as You say back side compare to machine look.

Please don't say that you know whats going on

[kalindd]

Tell your techs to open their Troubleshooting guide V5.0 and search for "Unevenness on edge".
There can be many reasons for this to happen.
I can assure you there is not an easy fix for this, it's combination of couple or more things.
Have they tried to swap the fusing unit? You say that you have 2 machines, this should be an easy task.
Like SCHWARZ suggested replace 1st fuser lower belt assy, fuser roller and external heater assy.

Choose
[Utility] -> [02 User Setting] -> [03 Common Setting] -> [Next] -> [Next] ->[Next] ->[Next] -> On Fusing stability priority choose "Image quality"

Have you tried to print with "Thin coated mode" activated?
[Utility] -> [02 User Setting] -> [03 Common Setting] -> [Next] -> [Prior Paper Type],[Thin Coated]
[Utility] -> [02 User Setting] -> [01 System Setting] -> [03 Paper Tray Setting] -> [81-105gsm Coated],select [Thin Coated] for the tray you want to use
in paper settings for this tray select CoatedGO and 81-105gsm. When you set this on the main screen you will notice small * that means that the function is active.
Choose different weight type.
I've read that you played with temps, but try this lower by 10 degrees only Fusing Roller Center Temp. (print) and (idle).

If none of mentioned above helps (but there should be some improvement) then:
Tell your techs to open their Troubleshooting guide V5.0 and search for "Unevenness on edge".

It can be as simple as, the sheet of paper enters the fusing unit skewed.
Make a panic stop and see whether the defect appears before the fusing unit ( is the image ok between the 2nd transfer and fusing unit)
Good luck.

[djchampion]

new report fro the front

8 hours non stop testing

Replaced whole heating unit with transfers (don't remember English name) from 100% working another machine. no results.

thanks panic stop - kalindd suggested

now we know that the transfer belts are not the problem

paper exhausted from the machine,

before heater the toner is correctly distributed on the edges.

behind the heater we see the issue from screens.

that means that the heater drum somehow disrupt the process.

of course its only a "probably" answer.

changing the subject - it seems that we get a new machine or two (DOA procedure)

I'll let you guys know, how the story ended. thats for sure.