What can cause this? I attached a sequence showing how it went from perfect to unusable.
I switched drum and the problem stays on black so not the drum (even after printing multiple white pages). When it began to be visible (third scan, scan108.jpg), I compared the main lines with the repeated defects page and it matched the fuser. I checked the fuser (without opening it) an nothing unusual was visible. I tried to clean the drum and the belt. No components have been swapped recently. Same pattern appears printing a white page (see additional scans). All scanned prints are A4 LEF.Glad to provide any info that may support diagnosing the problem.
Thanks for your help.
PS: don't mind the background on last pics: I recycled the empty side of some used thing paper
I switched drum and the problem stays on black so not the drum (even after printing multiple white pages). When it began to be visible (third scan, scan108.jpg), I compared the main lines with the repeated defects page and it matched the fuser. I checked the fuser (without opening it) an nothing unusual was visible. I tried to clean the drum and the belt. No components have been swapped recently. Same pattern appears printing a white page (see additional scans). All scanned prints are A4 LEF.Glad to provide any info that may support diagnosing the problem.
Thanks for your help.
PS: don't mind the background on last pics: I recycled the empty side of some used thing paper