My guess would be toner or fuser.
Is the toner cartridge OEM or aftermarket?
How does the transfer roller look?
Have you removed the transfer roller and blown out any residual toner in the transfer roller cavity?
How often does it repeat (measure in millimeters please)? =^..^=
If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=
it is very simple to repair it.
Problem is in the registration part.
Along the registration there is a black plastic element that lifts when a piece of paper passes by (marked in red)
On its left side there is a spout that hits the sponge so as not to make noise (marked in green). This tip sticks to the sponge, temporarily holding the paper on the rollers and thus the rollers make a mark on the sheet of paper.
Just stick a piece of tape on the sponge. This will prevent the sponge from sticking to the spout.
You're welcome
registration.jpg
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HP LaserJet P2035n
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