As a technician, I have worked on tons of printers. This particular
error had stumped me for a while, but I finally found the cause.
This error code can have a lot to do with some
obstruction in the print path, the gears, ink on the clear plastic
encoder strip, a small piece of paper in the gears, etc.
The first time I encountered this problem, 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 gray front panel of the printer - open the top
cover to see the clips which hold the front cover on.)
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