51
1.1.7 LED error
Symptom
Possible Cause
Inspection
Recovery
Feed Key
or
LED
indicators
do
not
work.
Unsecured
cable
connection.
Check
the
indicator
cable.
Re-connect
the cables.
The
cable
or
connector is damaged.
Check
the
indicator
cable.
Replace
the
cable
or
connector.
Key or LED indicator is
damaged.
Check key or indicator
circuit with oscillograph
or multitester.
Replace
the
key
or
indicator.
Key indicator circuit is
damaged.
Check the conducting
performance
of
the
circuit with multitester.
Replace
the
key indicator
circuit.
Status indicator circuit
is damaged.
Check
key
indicator
circuit with oscillograph
or multitester.
Replace
the
main board.