Checks / troubleshooting:
1. Is media edge sensor Assy cable at head connected
correctly?
2. Is media rear sensor Assy under media guide R
connected correctly?
3. Check sensor sensitivity from "Sen8:Edge AD" of self-
diagnosis function.
4. Is CR_FFC cable inserted obliquely?
5. CR_FFC may be damaged.
6. CR board Assy may be damaged.
7. Check presence of media from "Sen7:Rear AD" of self-
diagnosis function.
8. MAIN board Assy may be damaged.

Recommended actions:
Securely connect it to CR board Assy connector.