Service manual

2. Abnormal Paper Feed Operation 1
START
Dose
the PFmotor
rotate?
No
Is
CN10
connected
correctly?
No
Connect it
correctly.
Is the
problem
corrected?
END
YES
No
When
the printer is
powered on,
is paper ejected
automatically?
YES
No
Go to flowchart
2-1.
YES
YES
After
paper is
ejected, dose the
printer indicate
"Ready"?
Is the
resistance
of the PF motor
coils correct?
No
After
paper is
ejected, dose the
printer indicate
"Paper out"?
YES
YES
Replace the C186
MAIN Board
Replace the
PF motor.
Is the
probelm
corrected?
END
YES
YES
No
No
Is
somthing
stuck to the
surface of the
PW sensor ?
Remove the substance
blocking the sensor.
Is
something
jammed between
the front/rear PE sensor
and the platen ?
Dose
the sensor
operated
correctly?
Is the
problem
corrected?
No
YES
END
Replace the sensor.
Is the
problem
corrected ?
END
Replace the C186
MAIN board.
No
No
YES
YES
Clean the jam.
Is the
problem
corrected?
END
YES
YES
No
YES
YES
Are
CN5 and CN6
connected
correctly?
No
Connect them
correctly.
No
YES
Dose
the front and
rear PE sensor
operate
correctly?
No
Replace the sensor.
Is the
problem
corrected ?
END
YES
No
YES
Is the
problem
corrected?
END
Replace the C186
MAIN board.
YES
No
No
Is the
release lever
frinction
mode?
YES
Figure 5-3 Flowchart 2
Troubleshooting LQ-2070 Service Manual
5-6 Rev. A