[Dead] bizub c258 Image Quality Yellow

[Ruumduuly]

Hello Users!

I got Problems on my C258, full dot patern Yellow, changed dev, PCU, ITB, nothing changed.

Anyone can help ?


BR

[Bix]

Re: bizub c258 Image Quality Yellow

Hi, are you using original toner? How many pages has it done?
If it only does this with yellow, the glass of the PH Unit may be very dirty. Take the wand and clean the window of the PH Unit.
phwindow.jpg
Obviously you have to do it in the yellow section.

[Ruumduuly]

Re: bizub c258 Image Quality Yellow

Hello again

Allready cleaned complete Laser Unit. Problems only with yellow , using Original Toner; the machine is quite "new" 80k B/W and 2,5k Color sites

Thx 4 quick answer, any other ideas ?

BR

[copier tech]

Re: bizub c258 Image Quality Yellow

Hello Users!

I got Problems on my C258, full dot patern Yellow, changed dev, PCU, ITB, nothing changed.

Anyone can help ?


BR

Stop the machine mid run & remove the transfer unit what does the yellow image look like on the belt?

Looks like the y transfer roller bushing is broken in the transfer unit.

[Ruumduuly]

Re: bizub c258 Image Quality Yellow

Stop the machine mid run & remove the transfer unit what does the yellow image look like on the belt?

Looks like the y transfer roller bushing is broken in the transfer unit.

Allready changed Transfer Unit, 1 new One, 1 "old-used" from a perfectly working machine, still Yellow troubles


Image on the transfer Unit looks like the printed one (.pdf from 1st post) = Image bad on transferUnit

[tsbservice]

Re: bizub c258 Image Quality Yellow

Very strange. By changing developer you mean whole developer unit or just powder? Yelow magnetic brush nice and even? New OEM yellow drum unit, not some modified one?

[Synthohol]

Re: bizub c258 Image Quality Yellow

what does the brush on the DV unit look like?

[copier tech]

Re: bizub c258 Image Quality Yellow

what does the brush on the DV unit look like?

He replaced the dev unit so unlikely a new one has the same fault.

[Ruumduuly]

Re: bizub c258 Image Quality Yellow

He replaced the dev unit so unlikely a new one has the same fault.

Summary of Day 4 - repairing my C258

new Dev Unit Y
new PCU Y
new Transfer Image Belt
used Laser Unit from another working machine
connectors off/on High voltage Board & FrontBoard behind waste toner box (where DEV units and registration ...are connected on)

thx@all now time for weekend & BBQ

BR

[tsbservice]

Re: bizub c258 Image Quality Yellow

Any error codes present or in history? Almost looks like distance between developer and drum is too wide in areas where image is missing. Are we sure sample is LEF?

[fatduke]

Re: bizub c258 Image Quality Yellow

Hi man,

first use original toners, then check consumable status: drum, developer, transfer belt, transfer roller.

Then if the problem will be again empty yellow parts on printed paper, evaluate to change or refurbishind yellow developer.

Cheers

[copier tech]

Re: bizub c258 Image Quality Yellow

Hi man,

first use original toners, then check consumable status: drum, developer, transfer belt, transfer roller.

Then if the problem will be again empty yellow parts on printed paper, evaluate to change or refurbishind yellow developer.

Cheers

Read the previous comments before you post!

[tsbservice]

Re: bizub c258 Image Quality Yellow

Read the previous comments before you post!

Exactly! Should be even in Forum rules.

[Ruumduuly]

Re: bizub c258 Image Quality Yellow

Any error codes present or in history? Almost looks like distance between developer and drum is too wide in areas where image is missing. Are we sure sample is LEF?

No Error Codes. Sample is SEF. Now getting back to office trying to check - "modify" distance between drum and dev Unit.

[Toxic]

Re: bizub c258 Image Quality Yellow

Try same test print on A3 paper and post again.
Did somebody before "modify" DR/DV distance?