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First, open the top cover of the printer.
Wait a few seconds or longer. Does the carriage not move over into accessible position?
- if it does, you're OK as far as that goes.
- if it doesn't, then without closing the cover, nor turning Off the printer, simply pull the power plug on the printer sharply and suddenly.
Then wait a bit, and reach into the printer and try, gently and not forcibly, to move the carriage into accessible position. If you cannot, there may be no conclusion other than that the printer is 'broken' by some mischance. Esp. if you would have to exert force to move the carriage... that would mean something is jamming the carriage into the inaccessible position.