DC12 fade on OB edge SRA3

[TechMate]

I have a number of DC12's with the same problem.

All colors fade out on the last 5cm (2") of the outboard (front) edge.

I have checked the drum roll spacing, cleaned the ros window, changed the developer, done the max setup, changed the Xerographic module and changed the erase lamp.

Any ideas?

Let's go back to the original problem. We may have overlooked the basics.

My suggestion is to check the condition of the IBT assy, particularly the backup roll and the 1st BTR. It may look OK but replace it anyway to determine if it makes any difference.

Also, there's a plastic A-plate that holds the backup roll OB/ front bearing into place that could be cracked - replace it.

Another possibility is a skewed/ cracked IBT frame or a faulty drum which is causing the problem. So replace as necessary.

Try to crash-stop the image on the belt, if it looks solid/ NO fading on the OB as you've described, then the problem is mechanical.

But if it fades on the belt, then its xerographic - deal with NVMs.

[Jake2o]

I have changed the whole IBT assy for one in a known working machine. It does not make any difference.

The defect is visible on the drum when it is crash stopped. It is also visible in all 4 colours.

One of the machines is now working well enough for the customer not to notice. I have achieved this by very fine tweaking of the IB/OB setteing and making the highlight setting a bit darker than it should be.

I am not entirely happy with this remedy though because I am still uncertain what is causing the fault.

On another of the machines that would only fade when printing heavy colour jobs tapping the drum locater pin worked and it is much better than it was, but still far from perfect.

[TechMate]

Well, I think you've done the best move which is adjusting the IB/OB setting.

The other thing I can think of is 0.7mm developer gap which was suggested earlier and ROS cleaning including PRISMS which may be laborious and might not make any difference at all.

The worst thing that you might try to do is to change the ROS itself or LVPS that directly powers up the mag rolls/ deve assy (it may resolve the problem- but not worth replacing it just to satisfy a specific job)

So I say just stick to the IB/OB settings as a tech specialist always says *** its a machine limitation ***. NVM change might not be very helpful at this stage.

[re2055]

Hello are you there

Hello are you there
I need to contact you
Are your related to photocopiers? Can you be my friend? I too a Xerox Technician.

[re2055]

Then how it works with new Drum Cartridge

If there is NVM setting for the above problem or IBT unit then how it works with new Drum Cartridge.
I have seen in three different DC12 systems that when new cartridge is inserted the edges are perfect, but as it gets older with 3000-4000 copies, the same problem starts.


Anybody here thinks about next upcoming model 1256GA or 1257GA?
Even new 250/260 is not as glossy as DC12? Which model will lead the same role as DC12.

[TechMate]

If there is NVM setting for the above problem or IBT unit then how it works with new Drum Cartridge.
I have seen in three different DC12 systems that when new cartridge is inserted the edges are perfect, but as it gets older with 3000-4000 copies, the same problem starts.


Anybody here thinks about next upcoming model 1256GA or 1257GA?
Even new 250/260 is not as glossy as DC12? Which model will lead the same role as DC12.

Hi. the DC1256GA has been released since 2004 and some improvements done on the DC1257GA. The "olympia" DC250/260 is an american version of the "einstein" DC5065 which uses EA toners. Can't really compare DC12 with other copiers as it is oil-based and others are not.