I have changed drum.
I have changed toner.
This is on received fax or printed reports.
Anything on right side of page is difficult to read.
Pull out your drum unit and look inside machine above where the drum would be. you should see a black assembly that runs left to right with a "****" glass. may need a flashlight. clean that glass off with a clean rag. sometimes toner "scatter" will get on glass and cause this.
let us know,
razors
Have you tried both drum and toner supplies? cause it sounds like a drum fault, if you have tried a new drum and toner, and it is doing it when printing internal reports, receiving fax's and copying then you have a tecnical issue to do with charge and this would likely render machine unecomical to repair (unless you can find a bad contact with drum on machine). If it receives faxs clearly but copys black then it is different issue (ie optics).
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Is printer near a sunny window? Could be stray IR is getting thru and erasing or weakening the LASERs ability to write to the drum. Exposure to sunlight will ruin a photosensitive drum.
Check this and move or rotate printer
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