DC12 fade on OB edge SRA3

[Jake2o]

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?

[Veedle]

Right, we need some more info -
Does it fade in every colour in high and low densities ?
Can you see the faded area on the drum ? or the IBT belt ?
Some things to check -
Have you dome a MAX setup and all is OK ?
Can it be adjusted through the Highlight setup ?
Check the outboard bearing on the IBT backup roll ( the one thats on the very bottom ).
If the fading is only in high densities, the locating pin for the drum cartridge could be slightly out of position -
***CAUTION*** there are two pins on the frame, gently tap the one on the right towards the dev tanks. If you do this too far you will damage the drum - just give it a gentle tap then do a test print.

[Jake2o]

Both machines that I am working on at the moment are fading in all 4 colors. I have done a max setup and it is all ok.

One thing that is noticeable is that to get the inboard outboard density somewhere near even, the values have to be around 96 to 100 where they would normally be around 128.

It fades in all densities across the spectrum.

I will have to check to see if it is on the drum or the IBT belt. I will also check the backup roll bearing

I do have another DC12 on a customers' site where the fault is only in high densities. Again, I have tries all the usual suspects so I will try to tap that one as you suggest. On that one, the defect is definitely visible on the drum.

[xcopytech]

adjust developer blade gap to 0.70 mm.

[Jake2o]

adjust developer blade gap to 0.70 mm.

I have checked that, I have also replaced one of the dev housings just to eliminate it but it made no difference.

[xcopytech]

did you clean inside ROS or just ROS window?
if not clean ROS prism

[Jake2o]

did you clean inside ROS or just ROS window?
if not clean ROS prism

I just cleaned the ROS Window, I will try the prism tomorrow.

[Jake2o]

Right, we need some more info -
Does it fade in every colour in high and low densities ?
Can you see the faded area on the drum ? or the IBT belt ?
Some things to check -
Have you dome a MAX setup and all is OK ?
Can it be adjusted through the Highlight setup ?
Check the outboard bearing on the IBT backup roll ( the one thats on the very bottom ).
If the fading is only in high densities, the locating pin for the drum cartridge could be slightly out of position -
***CAUTION*** there are two pins on the frame, gently tap the one on the right towards the dev tanks. If you do this too far you will damage the drum - just give it a gentle tap then do a test print.

I have checked the IBT backup roll bearing and it is OK.

The defect is visible on the Xerographic module

[Veedle]

Before you try adjusting the drum locating pins, try pushing the outboard end of the drum cru towards the right as you are doing a test print.
If this fixes it then go ahead and adjust the pins...

[xcopytech]

clean prism and all mirrors in ROS.
be careful.
remove screws from bottom side of ros and remove prism, after that clean all mirrors in ROS.

[John]

fades at end of page

I have this same problem on heavier stock, xerox said that the paper springs up on the trailing edge as it goes thru the dc12 and causes this problem, no real fix. Didn't sound right to me.

[Veedle]

Your right, it doesn't sound right.
The previous posts where for faded edges, not a trail edge fade.
Are you getting a fade or is the image blurred ?
If it is blurring you could have NVM corruption.
Let us know...

[John]

It's as if the toner just starts to fade away almost as if on the last .5 inchs sometimes less sometimes a little more, the toner looks as though it is washed out and blotchy (if that makes sence), never on normal weight paper just cover.

[TechMate]

Hi. May I suggest the following if it is applicable

To dispense more toner to the developer, adjust NVM for max density
773-266 = 180 (Y)
773-267 = 180 (M)
773-268 = 200 (C)
773-269 = 130 (K)
The lesser the values, the greater the density achieved.

Also, if you run mostly on black jobs
776-066 = 300 (default is 900)
776-480 = 300 (default is 600)
This means the machine will tone-up more frequently. hence, this will slow down the machine.

Give it a go and see what happens

[Veedle]

Hello,
The NVMs listed by Techmate will only have an effect if you are suffering toner starvation or black dev overfill.
None will have any effect on your problem - however I would suggest checking those values as they are the recommended settings.
For the trail edge blur try the following settings...
772-036 = 150
772-037 = 271
if those NVMs already have those values try changing them both to 125
Good luck.