the print head and the logic board
in set. (Be sure to replace them at
the same time.)
(3) Head contact pin condition of the
carriage unit:
If the pin is bent or deformed,
replace the carriage unit.
(4) Cable connection:
- CR FFC (J502, J501, J500)
Re-connect the cable.
If any damage or breakage of the
cable is found, replace the carriage
unit.