Since I had been getting "Toner Low" messages when the display told me to "Replace the Drum." Fortunately, I had a new drum on hand. Therefore, I put a new toner cartridge in the drum housing and installed them.
I then got the "Dust on Drum" message. As instructed, I removed the assembly and "cleaned the toner wire," several times, without cancelling the "Dust on Drum" message. I then went to a back-up printer. For several days, I repeated the toner wire routine, without success. Thinking that the new toner cartridge might somehow cause the fault, I put the old one in, but no change.
I then put the OLD drum and new cartridge in, and the DCP7020 proceded to print the cue of stored documents. So I'm limping along with the "old" drum. (Copies look fine!) and keeping my fingers crossed.
Unfortunately, I've had the replacement drum long enough that I can't recall who the supplier was (I think it was Tiger Direct), so swapping with them is not an option.
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Re: Dust on Drum message after installinng new Drum
Dust on drum refers to as you correctly stated the wire, it carries a electric charge that transfers the image. If the wire gets contaminated the electricity dont flow right so dust on drum is desplayed, you drum cart is faulty, they are not repairable items, go buy another then claim new/old one as faulty from them. Um aH.
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Did you replace the waste (used) toner cartridge or the empty toner cartridge? These copiers have 2 "cartridges" .... one is waste (used) toner, the other is "new" toner for copying / printing etc. Some newer copiers have All in One units....Drum, New Toner, Waste (used) Toner. If you replaced the Waste Toner container (or dumped it) that should reset the code or error message.
Ignoring the Toner Empty Message
When the toner cartridge is empty, the machine shows a “Toner Empty”
message and stops printing.
You can set the machine to ignore the message when it displays and to
continue printing the pages.
1 Press Menu until “Machine Setup” appears on the display.
2 Press the scroll button ( or ) until “Ignore Toner” appears on the
bottom line and press Enter.
3 Press the Scroll button ( or ) to select “On” or “Off.”
Select “On” to ignore the Toner Empty message.
Select “Off” to stop printing when the message appears. This is the
4 Press Enter to save the selection.