Bizhub C220 Color Misregistration ( Ghost Lines) on Lower Half of Page

[Copycrazy]

Hello everyone,

I have a Konica Minolta Bizhub C220 and recently started experiencing a color misregistration issue.
In the lower half of the page, green lines are printed with noticeable yellow and cyan ghost lines next to them, as shown in the attached photo.
The upper half of the page prints correctly, only the bottom part is affected.

• No significant changes have been made to the machine recently.
• The issue appeared suddenly, without warning.
• I have already performed Image Stabilization multiple times (scanning the adjustment sheets), but the problem persists.

Any ideas what could be causing this? Could it be the transfer belt, sensors, or something else? How to solve?

Thanks in advance for any help or advice!

[tsbservice]

Could be anything based on your description.

[copyman]

What have you done so far? Remove transfer belt and clean the IDC sensors. Clean the print head windows, pull white flags in and out, then do gradation adjustment? What are the consumable life of the drums?

[Dianon]

There is a skew adjustemnt in the Servicemode [Machine]->[Skew adjustment]-> [Skew adjustment reset]
Normaly you only had to perform this, after replacing the PH Unit, but i had cases where the motors for aligning the mirrors in the PH Unit get missaligned, resulting in the same picture like yours.
Sometimes they find there correct possition again after this reset.

For better understanding i post you the sections from the servicemanual

image.png
image.png
image.png

[Copycrazy]

There is a skew adjustemnt in the Servicemode [Machine]->[Skew adjustment]-> [Skew adjustment reset]
Normaly you only had to perform this, after replacing the PH Unit, but i had cases where the motors for aligning the mirrors in the PH Unit get missaligned, resulting in the same picture like yours.
Sometimes they find there correct possition again after this reset.

For better understanding i post you the sections from the servicemanual

image.png
image.png
image.png

Hello

Thank for your help.

I did dthe skew adjustments but didn't work

I solved the issue cleanning the color registration sensor that is under the trasnfer belt. Now it work perfectly

[Copycrazy]

What have you done so far? Remove transfer belt and clean the IDC sensors. Clean the print head windows, pull white flags in and out, then do gradation adjustment? What are the consumable life of the drums?

Thank you. This worked! i cleaned the sensor and made the gradation and all working fine. No ghost lines

[copyman]

Thank you. This worked! i cleaned the sensor and made the gradation and all working fine. No ghost lines

Glad it worked! Thanks for following up.