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1A39 没人拆过机器的话，大概率喷头废了
1A39
Hardware Head error
The drive circuit in the Printhead is damaged due to a slant connection
of the Head FFC, etc., or the fuse of the Main Board Assy may has
blown because of such a wrong connection.

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
FFC.)