Random Banding

[magnapro]

Hi,
I have A VERY serious problem with my dc12. I am getting random banding in all 4 colours, running trail to lead edge. There is no specific measurement I can measure to get an idea where is is coming from. You know 3 cm means....
This is happening before the fuser.
I have changed the drum, checked the laser, checked the drum motor, changed the IBT belt, changed the cleaning station.
I have had this problem on and off for 3 months and now my "Mexican" technician's solution is to buy a new machine! after I have spent hours and buying parts...that I didnt need.
Please I really need some direction

[xcopytech]

Scan and post here image with defect so we can see what is your problem.

[davidj7]

How did this issue start? anything specific if you could remember

[magnapro]

Okay I have attached a sample of what the problem looks like. Now I am getting banding running both ways.
The problem started with lines running inboard to outboard way. A technician was brought in from Mexico City, the machine was completely disassembled and cleaned. He checked and changed the items I mentioned above. It did not solve the problem. I then changed the drum and the inboard to outboard lines went away but then the lead to trail started but very faint. Now as you can see we have them everywhere!!! I dont know whatelse to do. When I out in another drum it doesnt make a difference.

[JimmyB]

look like Charge Corotron gone.
try with another drum or replace Corotron.

[bojans]

She changed drum!

[davidj7]

did you change just the drum or the whole drum cru?

[bojans]

magnapro did you clean the laser? Did you insert new drum cartridge?
stop print on drum, if there are bandings you have problem with laser or drum!!!

[magnapro]

I am sorry I do not know what a whole drum cru is? I changed the drum itself and I also changed the scorotron, yes the laser was checked

[bojans]

We are all willing to help, but...
You should call experienced tech...