xerox dc 240 banding

[mastarad]

Hi,
I have a problem. lighter band width of 1 cm along the direction of printing. What is the reason?
See attachment.

[seansbar]

Re: xerox dc 240 banding

I'd look at cyan drum.

On second look looks like all the colors are affected, If the cyan drum swap dosen't change anything, look at the 2nd BTR and/or fuser

[Milo Wilson]

Re: xerox dc 240 banding

you have toner on the inside of your cyan/black laser. You will need to take the ros assy.out and clean the window or the inside.

[mastarad]

Re: xerox dc 240 banding

Thanks for reply everybody.
I changed the drums and is unchanged. What substance can clear this laser? Isopropyl Alcohol is good? Mayby ethanol? I just read how to get to the laser (service manual).

[seansbar]

Re: xerox dc 240 banding

Before taking out the ROS assemblies, It try cleaning from below. Take out the transfer belt assembly, and the drum/developer trays and use a dry cloth or cotton swabs to clean the ROS windows.

[mastarad]

Re: xerox dc 240 banding

I did not write the test shows 50% of the coverage. The problem occurs only in halftones

[mastarad]

Re: xerox dc 240 banding

I will try.

[mastarad]

Re: xerox dc 240 banding

Before taking out the ROS assemblies, It try cleaning from below. Take out the transfer belt assembly, and the drum/developer trays and use a dry cloth or cotton swabs to clean the ROS windows.

My cleaning aggravated the situation. Now there are many thin strips of black. Maybe cleaning direction was bad. I hope it does not damaged anything.

[seansbar]

Re: xerox dc 240 banding

There still is dirt or toner on the black ROS window, try cleaning more, it may take removing ROS to get it all. If you got toner dusting that much in the ROS windows, you may need developer changes.

I see your orginal issue is still there. I see the same defect in the green area. Is this test page a copy? if so print out some internal test pages, no defect then look at the scanner.

[adriansto]

Re: xerox dc 240 banding

Make tests with basic colors 30% and stop the machine before the transfer start. Then see on IBT how the image looks. In that way you may know where defect comming

[mastarad]

Re: xerox dc 240 banding

There still is dirt or toner on the black ROS window, try cleaning more, it may take removing ROS to get it all. If you got toner dusting that much in the ROS windows, you may need developer changes.

I see your orginal issue is still there. I see the same defect in the green area. Is this test page a copy? if so print out some internal test pages, no defect then look at the scanner.

I printed internal pages from workstation (didnt copy from the glass).I was cleaning and black has more white stripes. I was cleaning ros and 2 cm width glass panel (next to black ros).

[mastarad]

Re: xerox dc 240 banding

when removing the tray a little black developer flew off. From there the problem of black visible on the second picture attached. Now, developer tossed around housing developer and I have a little trouble. I got it too little. Across the black is 30% less density. I will order a set of developer. I go back to the topic.
Thanks for the help guys.

[mastarad]

Re: xerox dc 240 banding

Developer filled. I got to the ROS CK and properly cleaned glass. The problem with the black gone but still in the blue is lighter. Anyway, I'm at the starting point. I studied the optics of the ROS. I noticed the rectangular mirror under the glass - splinters on a white surface. But I do not know if this has any effect on output. Well I'm at least at the starting point and there is no problem with black. After twisting machine I get an error cennection Yellow ROS, but luckily the tape was loose on board, not by ROS. ehh.

[adriansto]

Re: xerox dc 240 banding

The mirrors of ROS is more important that the glass. Clean them vey good. From this mirror the laser beam is reflected on drums. Dirty mirror means weak laser beam means light image on drum and so on.

[kajsa39]

Re: xerox dc 240 banding

I always us a puffer and it works every time if you tackle it from below with the IBT out.