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The error code 6A81 indicates an issue with the purge unit.This usually requires a repair\service of the unit.
However, you may try the below steps:
remove the cartridge...turn off the unit....unplug the power cable...manually 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 alcoholonce these steps have been done follow the below steps as wellmanually move the printhead to far lefton the far right there is a little white plastic tab that is spring loadedjust check that if its not getting jammedpush the tab towards the front of the printeronce done just turn on and check the status
in case still the error repeats and you get the same error code, then it is an issue with the purge unit.. if the unit is within warranty cover please contact Canon and get the unit serviced...if not, you need to contact a repair tech for physical replacement of the part..however, my personal suggestion is that a repair will not be cost effective
you can get a new unit at almost the same or little more cost
i hope you understand that in case of hardware faults i can suggest cleaning and reset steps but cannot make a bad part work again
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