1. Check the connection of the Head FFC to the Sub Board Assy, and
correct it if there is a slant connection or the cable is disconnected. If
any connection terminal of the Head FFC is damaged, replace it with
a new one.
2. Replace the Printhead.(See P.270)
3. If the printer does not recover from the error after trying 1 and 2.,
replace the Main Board Assy. (See P.228) (The fuse of the Main
Board Assy may have blown due to a slant connection of the Head