KM C258 offsetting issue

[copier addict]

The odd thing to me is that it appears that the white lettering (paper surface) is what is being shadowed with toner later on the page. It's not like it's a toner repeat. It's more of a negative shadow. I can't figure a good explanation for this one.

Have you stopped during print cycle to see the same image is on the transfer belt?

[JDR]

Well that issue occures only with high coverage prints.
If i print the bird demo, the work is perfect.

After a print, i removed the belt to check : the issue was on the sheet but not visible on the belt.

And i'm agree with darry, looks like negative shadows...

[Toxic]

When you replaced ITB did you replace transfer roller,just guess...

[Gift]

This ghosting image looks like the charge or grounding isn't evenly spreaded among the surface after the erasing so the OPC surface isn't properly prepared for processing, that's why you noticed ghosting from frevious drum rotation with hard contrast image parts. Perhaps you can try and improve the drum grounding with conductive grease and you also might test the same file on a different C258 / xx8 to see if this might be (more or less) reproduceable there as well. You might also try and swap or re-seat the HV board or try some sp mode fiddling first (I'm not so familiar wih KM but there's probably some charge related settings you can mess around with^^).

[Don N.]

Any possibility of a power supply issue, as c220 series sometimes caused some fusing offset?

[UKTeam]

Well its been a while since I posted here, but I still read most weekdays.

I want to jump in on this thread because I have had exactly this, although it was a C224e.
Don't ask me why, because the MFP was in a standard office, not too hot, not too cold, not too humid...etc.
And the issue as you say, shows on the fuller fills.

You are seeing the remnants of a latent Drum image which is not fully discharged.

I managed to cure this by reducing the PRIMARY transfer voltage. (Not secondary..!)

Service Mode - Image Process Adjust - Trans Voltage Fine Adj.
Start by setting all colours to minimum (-8) and gradually bring them back up a step at a time until the image issue re-occurs.
Then simply drop back one step until you are happy.
I believe mine was a mix of -4 and -5.

It will be interesting to know if this helps you, particularly since this is a C258 Direct contact Charge Drum Unit as opposed to the C224e Air charging...

regards,
Mark

[JDR]

Well its been a while since I posted here, but I still read most weekdays.

I want to jump in on this thread because I have had exactly this, although it was a C224e.
Don't ask me why, because the MFP was in a standard office, not too hot, not too cold, not too humid...etc.
And the issue as you say, shows on the fuller fills.

You are seeing the remnants of a latent Drum image which is not fully discharged.

I managed to cure this by reducing the PRIMARY transfer voltage. (Not secondary..!)

Service Mode - Image Process Adjust - Trans Voltage Fine Adj.
Start by setting all colours to minimum (-8) and gradually bring them back up a step at a time until the image issue re-occurs.
Then simply drop back one step until you are happy.
I believe mine was a mix of -4 and -5.

It will be interesting to know if this helps you, particularly since this is a C258 Direct contact Charge Drum Unit as opposed to the C224e Air charging...

regards,
Mark

Looks like you got it !
I had to set all values to -6 to fix this issue.
Does it mean HV board is faulty ?

[UKTeam]

Sorry JDR, had a week off work and missed this...

Firstly, I'm glad this works for you too, and thanks for the feedback.

As for the question "Is the HV PCB faulty", no I don't think so.
Its just some undefined environment issue.
My 224e is just as happy now as it was a couple of years ago when I changed these settings.
Don't worry anymore about it..!

Mark

[Savian]

Well its been a while since I posted here, but I still read most weekdays.

I want to jump in on this thread because I have had exactly this, although it was a C224e.
Don't ask me why, because the MFP was in a standard office, not too hot, not too cold, not too humid...etc.
And the issue as you say, shows on the fuller fills.

You are seeing the remnants of a latent Drum image which is not fully discharged.

I managed to cure this by reducing the PRIMARY transfer voltage. (Not secondary..!)

Service Mode - Image Process Adjust - Trans Voltage Fine Adj.
Start by setting all colours to minimum (-8) and gradually bring them back up a step at a time until the image issue re-occurs.
Then simply drop back one step until you are happy.
I believe mine was a mix of -4 and -5.

It will be interesting to know if this helps you, particularly since this is a C258 Direct contact Charge Drum Unit as opposed to the C224e Air charging...

regards,
Mark

Thank you very much, your post worked excellently. The ghosts desappeared.

[Kannaneact]

Well its been a while since I posted here, but I still read most weekdays.

I want to jump in on this thread because I have had exactly this, although it was a C224e.
Don't ask me why, because the MFP was in a standard office, not too hot, not too cold, not too humid...etc.
And the issue as you say, shows on the fuller fills.

You are seeing the remnants of a latent Drum image which is not fully discharged.

I managed to cure this by reducing the PRIMARY transfer voltage. (Not secondary..!)

Service Mode - Image Process Adjust - Trans Voltage Fine Adj.
Start by setting all colours to minimum (-8) and gradually bring them back up a step at a time until the image issue re-occurs.
Then simply drop back one step until you are happy.
I believe mine was a mix of -4 and -5.

It will be interesting to know if this helps you, particularly since this is a C258 Direct contact Charge Drum Unit as opposed to the C224e Air charging...

regards,
Mark

thq so much