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The error code 5100 usually comes up after paper jam on printers.The error indicates 2 possibilities, either their is something stuck or a sensor detecting the paper jam issues has faulted.
Please try the below stepsremove ink cartridges....turn off the unit....unplug the power cablemanually slide the carriage assembly\ printhead back and forthalso clean the rail against which the assembly slides with a tissue ensuring that there is no ink residue on itclean the golden contacts of the cartridges and the printhead with a cotton swab dipped in little alcoholNow check the paper feed tray, roller assembly area and the area where the carriage moved for any stuck obstruction like paper, paper clips, pins etc and if found remove it.once done turn the unit back on and check
if even after performing the above steps, the error 5100 continues, then an electric sensor that detects paper jams has faulted. If the unit is within warranty cover get the unit serviced through CanonIf the unit is out of warranty, then you may contact a local repair store for service.However, sensors repairs\replacement in such case is costly and it is more cost effective to opt in for a new unit.let me know if you have any questions
i hope you understand that in case of hardware fault or mechanical jam i can only suggest steps to rectify it but cannot make a bad part work again or clear an internal jamlet me know if you have any questionsplease click on smiley face\stars to rate my service if you are satisfied with the information recievedThanks for choosing just answer