Check the power packs- ppg ang cgb
Does the smudge appear when coping through the ADF only ,off the platen glass only , print only?
Do you have an sample copy for the different times the problem occurred?
Lets say a sample of the fault for Monday, and a sample of the fault for Friday.
Can you overlay the sample copies one on top of the other, hold them up to the light; is the fault blurb an exact match ?
If the blurbs are an exact match you can rule out insects or rodents moving around in the optics.
I would lean toward quenching lamps/laser.
Maybe paper dust build up behind the rego roller???
The above might jog a light bulb in someone.
Inauguration to the "AI cancel-culture" fraternity 1997...
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Hey I don't work on that particular model, but just to throw it out there: because one edge of the smudge looks straight, maybe part of the smudge has been cleaned by the drum blade, and if so, could it be on the drum after printing. Therefore, caused by a blanking lamp (or whatever it is referred to in that model). Charge not being completely eliminated from the drum? Just a thought.
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Memento Audere Semper
My guess is that the smudges are roughly the same distance from the front edge of the drum. Since you say it does it with 2 different drums, I would say that the smudge from the two drums are not the exact same size, shape and distance from the front edge. They are smudges on the surface of the drums caused by mishandling the drum when first installing, possibly a palm print. Tje straight line on one edge of the smudge is from the edge of the protective paper that is wrapped around a new drum.
The smudges doesn't match each other but they are exactly on the same height on the sheet... The strange thing is they appear for some copies... Than disappear for days or sometimes weeks... And then back again.... Without touching or removing the pcu unit
Inviato dal mio SM-G935F utilizzando Tapatalk
Memento Audere Semper
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