What is the problem with the Brother MFC-J3520 printer?

Question

Iron

Good afternoon.
Colleagues, tell me please what could be the problem?
The printer swears at a paper jam, there is no jam, there are no pieces of paper either, when you try to turn on the
print head rests on the edge and is clearly trying to go further. Maybe a sensor has gone bad.
If someone has normal mana for troubleshooting and disassembling this printer, I will also be grateful. On the website from the manufacturer - one water.
Model Brother MFC-J3520.
Process video

Answer 1

Well you give
https://www.google.ru/search?client=ubuntu&channel...

Answer 2

Wipe, only with a carefully damp cloth, the encoder is a plastic tape with applied risks passing through the print head - the main thing is not to erase the risks themselves, because. they are positioned.