Casio PX-780 - Scanner LED and Sensor Issues

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4-9. Scanner LED NG
FFC
damaged?
Check the connection
of CN11.
After replacing the
PW PCB, check again.
FFC is defective.
Connector is loosely
connected.
MAIN PCB is defective.
PW PCB is defective.
OK
Yes
NG
No
OK
NG
4-10. Sensor NG
AD3
NG?
CN11
AD4-6
NG?
AD0-2
NG?
After replacing the PR
PCB, check again.
MAIN PCB
is defective.
FFC is defective.
PW PCB is
defective.
Connector is
loosely
connected.
Printer is defective.
PR PCB is
defective.
CN19
After replacing
the Printer,
check again.
Yes
YesYes
Yes
OK
OK
OK
OK
No
No
No
No
No
NG
NG
NG
NG
FFC
damaged?