Checks / troubleshooting:
1. Check connection of Head FFC.
2. Check connection of CR_FFC.
3. Head FFC may be damaged.
4. CR_FFC may be damaged.
5. Print head may be damaged.
6. MAIN board may be damaged.

Recommended actions:
1. Make sure to connect Head FFC surely.
2. Make sure to connect CR_FFC surely.
3. Replace Head FFC.
4. Replace CR_FFC.
5. Replace Print head.
6. Replace MAIN board.