Hello, the error 5100 as to a lot to do with some obstruction in the print path, the gears,
or ink on the clear plastic encoder strip. You're on the right track - I
found the the purge cap (the white sliding mechanism that the print
head parks to when it's not in use) was not lubricated well enough from
factory. If you lubricate the sliders with some white grease (don't get
it on the small wipers or the black caps) the mechanism can now slide
more freely, and the unit can park the head properly without giving you
the dreaded head homing error 5100 (or E-2-2 on the LCD display) Keep in
mind that this repair will probably require you to remove the right
panel off of the printer to gain access to the purge mechanism. There
are two screws behind the printer, and two in front for each corresponding side panel (the front screws are behind the Grey front
panel of the printer - open the top cover to see the clips which hold
the front cover on).
Thanks
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